Gray's Anatomy Chapter 59 - Abdomen and Pelvis (Overview and Surface Anatomy)

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Questions and Answers

Which feature is NOT a primary component of the abdominopelvic cavity's role in supporting overall body function?

  • Providing a conduit for neurovascular communication to the lower limbs.
  • Facilitating gas exchange to supplement respiratory function. (correct)
  • Housing and protecting internal reproductive organs.
  • Supporting the vertebral column during movement and weight-bearing.

Damage to which structure during surgery in the abdominopelvic region is LEAST likely to cause sexual dysfunction?

  • Thoracic splanchnic nerves. (correct)
  • Lumbar splanchnic nerves.
  • Superior hypogastric plexus.
  • Sacral part of the sympathetic trunk.

Which characteristic differentiates the roles of the greater thoracic splanchnic nerve and the pelvic splanchnic nerves in autonomic innervation?

  • The greater thoracic splanchnic is sympathetic, whereas the pelvic splanchnic is parasympathetic. (correct)
  • The greater thoracic splanchnic serves primarily vasoconstrictive functions, while the pelvic splanchnic serves secretomotor functions.
  • The greater thoracic splanchnic originates in the lumbar spinal segments, unlike the pelvic splanchnic.
  • The greater thoracic splanchnic targets somatic structures, while the pelvic splanchnic targets visceral structures.

How might variations in the course or connectivity of thoracic splanchnic nerves impact surgical interventions in the abdomen?

<p>By dictating the precision required during nerve-sparing procedures due to unpredictable nerve pathways. (B)</p> Signup and view all the answers

A patient presents with disruption of sympathetic innervation to the lower limb following a surgical procedure. Where was the MOST likely site of iatrogenic injury?

<p>Lumbar sympathetic trunk. (A)</p> Signup and view all the answers

During a surgical procedure, a surgeon encounters a solitary retroperitoneal structure formed by the convergence of the sacral part of the sympathetic trunk. What is the functional implication of potentially damaging this structure?

<p>Intractable perineal pain due to disruption of sympathetic and nociceptive afferents. (B)</p> Signup and view all the answers

Which adaptation in the arterial supply BEST allows for continued perfusion to the gastrointestinal tract even when there is stenosis or occlusion in one of the main feeder arteries?

<p>Extensive anastomoses between the superior and inferior mesenteric arteries. (B)</p> Signup and view all the answers

What anatomical arrangement enables the performance of coeliac plexus blockade for pancreatic cancer pain relief, and what visceral afferent fibres are targeted?

<p>Coeliac plexus's location anterior to the crura of the diaphragm, targeting visceral afferent fibres conveying pain and other sensations. (B)</p> Signup and view all the answers

After a traumatic injury, a patient is found to have absent peristalsis and severely reduced intestinal motility despite an intact autonomic nervous system. Which cellular component is MOST likely dysfunctional?

<p>Interstitial cells of Cajal (ICCs). (A)</p> Signup and view all the answers

Given the organization of the enteric nervous system, what consequence would result from complete disruption of the myenteric plexus in a segment of the small intestine?

<p>Absence of coordinated peristaltic activity. (A)</p> Signup and view all the answers

How does the histological composition of the oesophagus differ from that of the small intestine in relation to protection and function?

<p>The oesophagus has a thicker, stratified epithelium to protect against mechanical and chemical damage, while the small intestine has a single-layered epithelium optimized for absorption. (B)</p> Signup and view all the answers

Where would one MOST reliably palpate the abdominal aorta to compress it against the vertebral column and why?

<p>In the midline from the upper abdomen inferiorly because the aorta descends along the lumbar vertebral bodies. (B)</p> Signup and view all the answers

During a medical procedure, a physician needs to access the femoral artery just inferior to the inguinal ligament. Which landmark should the physician use to locate this point accurately?

<p>A point midway between the anterior superior iliac spine and the pubic symphysis. (A)</p> Signup and view all the answers

Which surface landmark would be MOST suitable for estimating the location of the renal hila in a supine adult when planning a percutaneous nephrostomy?

<p>The transpyloric plane. (B)</p> Signup and view all the answers

What anatomical relationship is MOST relevant when performing a suprapubic catheterization, and how does bladder filling affect this relationship?

<p>The position of the urinary bladder relative to the pubic symphysis; bladder filling elevates the superior aspect above the pubis, facilitating access. (D)</p> Signup and view all the answers

Why is knowledge of precise anatomical relationships important in laparoscopic surgery, and specifically, when inserting trocars through the anterior abdominal wall?

<p>Because it minimizes the risk of injury to major abdominal vessels. (C)</p> Signup and view all the answers

A surgeon is performing a laparoscopic cholecystectomy, and needs to identify anatomical relationships to ensure safe dissection. Which anatomical landmark needs to be precisely located, and what catastrophic damage is the surgeon trying to avoid?

<p>The cystic duct entry into the common bile duct, to avoid damage to the pancreatic duct. (B)</p> Signup and view all the answers

During a paracentesis, which abdominal layer/anatomical consideration would be MOST important in reducing the risk of complications?

<p>The linea alba. (D)</p> Signup and view all the answers

In the context of surface anatomy, what makes Tuffier's line especially clinically relevant for procedures such as lumbar punctures?

<p>Tuffier's line identifies the termination point of the spinal cord. (A)</p> Signup and view all the answers

In which clinical situation might knowledge of the semilunar (Spigelian) line prove MOST useful for diagnosis or surgical planning?

<p>To examine abdominal musculature. (C)</p> Signup and view all the answers

In assessing anterior abdominal wall during muscle tension, what is the anatomical significance used for identifying the rectus abdominis muscle's position

<p>The midclavicular line. (D)</p> Signup and view all the answers

A patient undergoes a procedure involving disruption of the least thoracic splanchnic nerve. Which visceral organ would MOST likely be affected by this iatrogenic injury?

<p>The kidney, potentially altering renal function (A)</p> Signup and view all the answers

In a surgical scenario where the first lumbar splanchnic nerve is inadvertently damaged, what specific consequence is MOST likely to occur?

<p>Disrupted function within the digestive system (D)</p> Signup and view all the answers

What is the MOST critical anatomical consideration for a surgeon performing a coeliac plexus blockade to manage pain from pancreatic cancer?

<p>Accurately targeting visceral afferent fibers while avoiding injury to major vascular structures (B)</p> Signup and view all the answers

Following a motor vehicle accident, a patient is diagnosed with damage to the sacral part of the sympathetic trunk. What specific long-term complication is MOST probable given the trunk's function?

<p>Sexual dysfunction (C)</p> Signup and view all the answers

During a surgical intervention within the pelvis, the ganglion impar is inadvertently damaged. What sensory or functional loss is the patient MOST likely to experience postoperatively?

<p>Altered nociception from the perineum and terminal urogenital regions (B)</p> Signup and view all the answers

In the context of a laparoscopic appendectomy, what is the MOST relevant anatomical implication of the variable position of the appendix?

<p>It can affect the choice of trocar insertion site and surgical approach (D)</p> Signup and view all the answers

What is the MOST critical anatomical consideration when performing a suprapubic catheterization to minimize iatrogenic injury?

<p>The relationship of the bladder to the peritoneum and degree of bladder filling (A)</p> Signup and view all the answers

During a total colectomy involving the removal of the colon, the surgeon aims to preserve autonomic nerve function. What anatomical structures are MOST at risk of being damaged during ligation of the inferior mesenteric artery?

<p>Lumbar splanchnic nerves contributing to the hypogastric plexus (A)</p> Signup and view all the answers

A patient is experiencing vascular insufficiency in the lower limb due to peripheral artery disease. If a surgeon plans to perform a lumbar sympathectomy, what anatomical landmark is MOST critical for accurately ablating the sympathetic ganglia?

<p>The position of the psoas major muscle and lumbar arteries (D)</p> Signup and view all the answers

During a retroperitoneal approach for a nephrectomy, what anatomical structure serves as the MOST reliable landmark for identifying the renal hilum?

<p>The transpyloric plane (B)</p> Signup and view all the answers

In a patient presenting with chronic pelvic pain, a physician decides to perform an anesthetic blockade of the ganglion impar. Which anatomical relationship is MOST important to understand to minimize the risk of complications during this procedure?

<p>The variable location of the ganglion impar relative to the sacrococcygeal joint (B)</p> Signup and view all the answers

A surgeon performing an ileostomy aims to create a dynamic, contractile surround to reduce the risk of herniation. What anatomical feature is MOST critical for achieving this goal?

<p>Splitting the fibers of the rectus abdominis muscle while avoiding the epigastric vessels (A)</p> Signup and view all the answers

What anatomical variation should a surgeon consider when mobilizing the splenic flexure during a colectomy, considering potential impacts on vascular supply?

<p>The prevalence of accessory or replaced vessels arising from the superior mesenteric artery (B)</p> Signup and view all the answers

How would damage to the pelvic splanchnic nerves during a surgical procedure such as a radical prostatectomy MOST directly manifest clinically?

<p>Impaired control of the urinary bladder and erectile dysfunction (C)</p> Signup and view all the answers

What BEST describes the relationship between the respiratory diaphragm and the thoracic splanchnic nerves as they traverse to the abdomen?

<p>The greater thoracic splanchnic nerve enters through the crura while the lesser and least thoracic splanchnic nerves pass under the medial arcuate ligament. (D)</p> Signup and view all the answers

A trauma surgeon needs to quickly locate the abdominal aorta during an exploratory laparotomy. Which technique would be MOST reliable for identifying the abdominal aorta during bleeding event?

<p>Palpate deeply in the midline, compressing against the vertebral bodies. (D)</p> Signup and view all the answers

During a right hemicolectomy, what anatomical structure, if inadvertently injured, would MOST significantly disrupt venous drainage from the small intestine and associated structures?

<p>The superior mesenteric vein (A)</p> Signup and view all the answers

During a surgical procedure, postganglionic sympathetic fibers are stimulated, leading to the inhibition of smooth muscle motility and glandular secretions in abdominal viscera. How does this effect occur?

<p>By releasing norepinephrine, leading to vasoconstriction and reduced visceral activity. (C)</p> Signup and view all the answers

In the context of an experimental study investigating enteric nervous system function, selectively ablating interstitial cells of Cajal (ICC) in the gut wall leads to what significant observation?

<p>Reduced smooth muscle contractility and disrupted pacemaker activity. (D)</p> Signup and view all the answers

During the dissection of the abdominal wall, a medical student palpates the anterior abdominal wall and identifies a curved depression that is superficial. What is its anatomical significance?

<p>The lateral margin of the rectus sheath, termed the semilunar line (Spigelian line). (B)</p> Signup and view all the answers

If a surgeon plans a minimally invasive procedure with trocar insertion, how does the relationship between the inferior epigastric artery and the linea alba MOST influence the placement?

<p>The artery runs along the lateral border of the linea alba, with insertions requiring the lateral distance to reduce arterial injury risk. (B)</p> Signup and view all the answers

If a surgeon uses Tuffier's line during a lumbar puncture, what anatomical structure does it reference, and how does this positioning prevent complications?

<p>It references surface positioning with vertebral levels, avoiding spinal cord damage during lumbar positions. (A)</p> Signup and view all the answers

During an investigation into gastrointestinal dysmotility, a researcher induces selective damage to the myenteric plexus. What physiological change is MOST directly attributed to the disruption of this plexus?

<p>Complete absence of peristalsis (A)</p> Signup and view all the answers

During an ERCP, the endoscopist has a challenge locating the duodenojejunal flexure. Based on anatomical landmarks, where should they MOST accurately search for this flexure?

<p>Level with inferior half of vertebral body of T11 to superior half of the vertebral body of L3 (D)</p> Signup and view all the answers

Which aspect of the abdominopelvic cavity's function is MOST compromised if the vertebral column loses its normal curvature?

<p>Support for the vertebral column in weight-bearing, posture and movement. (C)</p> Signup and view all the answers

Damage to the fibres of the ipsilateral crus of the respiratory diaphragm during a surgical procedure is MOST likely to directly impact which structure?

<p>The greater thoracic splanchnic nerve. (D)</p> Signup and view all the answers

Which anatomical structure is MOST likely to be compromised if a surgical procedure inadvertently damages the median arcuate ligament?

<p>The aortic hiatus. (B)</p> Signup and view all the answers

If a patient experiences impaired weight transmission and instability following a pelvic fracture, which anatomical interface is PRIMARILY affected?

<p>Pelvis-lower limb interface (B)</p> Signup and view all the answers

Which autonomic response is MOST likely to be observed, if the sympathetic trunk is stimulated?

<p>Vasoconstriction (A)</p> Signup and view all the answers

What is the MOST likely outcome of disrupting the white ramus communicantes at the L1 spinal segment?

<p>Disruption of sympathetic supply to abdominal viscera (B)</p> Signup and view all the answers

During a surgical procedure, branches from the lumbar sympathetic trunk are inadvertently severed. What specific function related to the lumbar arteries is MOST likely to be affected?

<p>Vasoconstriction (C)</p> Signup and view all the answers

What visceral effect is MOST likely to result from surgical damage to the sacral splanchnic nerves?

<p>Impaired bladder function (C)</p> Signup and view all the answers

What is the MOST likely consequence of selectively blocking the coeliac plexus?

<p>Alleviated pain from pancreatic cancer (C)</p> Signup and view all the answers

What is the MOST likely result of disrupting the vagal trunks as they enter the abdomen through the oesophageal hiatus?

<p>Reduced gastric acid secretion (B)</p> Signup and view all the answers

If the superior mesenteric artery is damaged during a surgical procedure, disrupting the flow of the venous system, which tributary would MOST likely be affected?

<p>The superior mesenteric vein. (D)</p> Signup and view all the answers

What is the functional significance of the microvilli found on the epithelium of the small intestine?

<p>Increased surface area for absorption (A)</p> Signup and view all the answers

What effect do stimulating the muscularis mucosae have on the stomach and large intestine?

<p>Increase localized contraction (B)</p> Signup and view all the answers

What is the MOST likely clinical consequence of extensive damage to the myenteric plexus?

<p>Disrupted coordinated peristalsis (B)</p> Signup and view all the answers

What functional change would be MOST expected following the selective ablation of interstitial cells of Cajal (ICCs) in the gastrointestinal tract?

<p>Disrupted rhythmic contractions (C)</p> Signup and view all the answers

What is the MOST likely effect of applying firm pressure along the midline to compress the abdominal aorta against the lumbar vertebrae?

<p>Palpation of abdominal pulsations (C)</p> Signup and view all the answers

In the absence of clear external landmarks, what anatomical feature is MOST useful for locating the transpyloric plane?

<p>A location roughly midway between the xiphisternal joint and the umbilicus (A)</p> Signup and view all the answers

What is the MOST clinically relevant implication of identifying Tuffier's line (supracristal plane) during a lumbar puncture?

<p>Estimating the level of the aortic bifurcation (A)</p> Signup and view all the answers

What is the MOST clinically significant anatomical implication of the linea alba's structure in abdominal surgeries?

<p>Relatively low vascularity for surgical incisions (B)</p> Signup and view all the answers

During a laparoscopic surgery, what anatomical knowledge is MOST critical for safe trocar insertion to avoid injury to the inferior epigastric artery?

<p>Trocar must be inserted two-thirds of distance along a horizontal line between the midline and the sagittal plane passing through the anterior superior iliac spine. (C)</p> Signup and view all the answers

What anatomical characteristic of the rectus abdominis muscle is MOST leveraged when creating an intestinal stoma to reduce the risk of herniation?

<p>The presence of dynamic, contractile surround (B)</p> Signup and view all the answers

What anatomical relationship should be accounted for when performing a suprapubic catheterization?

<p>As the urinary bladder fills, its superior aspect rises above the pubis. (B)</p> Signup and view all the answers

What surgical approach is BEST applied when performing a cholecystectomy?

<p>Laparoscopic (A)</p> Signup and view all the answers

How does a surgeon account for a kidney's movement, if moving from lying to standing during operation?

<p>Can descend by several centimetres when moving from lying to standing (B)</p> Signup and view all the answers

What is the best method to define the transpyloric plane?

<p>A landmark midway between the suprasternal bone and superior pubic region. (C)</p> Signup and view all the answers

If a surgeon is approaching a kidney for surgical observation, where should the approach occur?

<p>About six centimenters midline in males and five in females. (B)</p> Signup and view all the answers

While performing surface examination on the duodenum, what orientation is MOST effective?

<p>The duodenum's ascending is to the left of its descending section. (A)</p> Signup and view all the answers

When viewing abdominal wall structures, what orientation corresponds to the vessels?

<p>An obliquely inferior plane (D)</p> Signup and view all the answers

The abdominal cavity has a perfectly circular shape in horizontal cross-section.

<p>False (B)</p> Signup and view all the answers

The aortic hiatus transmits the aorta, thoracic duct, and azygos vein.

<p>True (A)</p> Signup and view all the answers

The pelvis only functions as part of the lower limbs and not the abdominopelvic cavity.

<p>False (B)</p> Signup and view all the answers

Autonomic nerves always travel independently and are not associated with the arterial supply to the lower limb.

<p>False (B)</p> Signup and view all the answers

Sympathetic stimulation of visceral smooth muscle motility generally inhibits it.

<p>True (A)</p> Signup and view all the answers

The greater thoracic splanchnic nerve is derived from the medial branches of the fifth to ninth thoracic ganglia.

<p>True (A)</p> Signup and view all the answers

The coeliac ganglion primarily synapses the preganglionic fibres destined for the adrenal medulla.

<p>False (B)</p> Signup and view all the answers

The lumbar part of the sympathetic trunk typically consists of six ganglia lying on the anterolateral aspects of the lumbar vertebrae.

<p>False (B)</p> Signup and view all the answers

Lumbar splanchnic nerves exclusively innervate the wall of the digestive organs.

<p>False (B)</p> Signup and view all the answers

The ganglion impar is a paired retroperitoneal structure formed by the convergence of the sacral sympathetic trunks.

<p>False (B)</p> Signup and view all the answers

White rami communicantes are present at the level of the sacral spinal nerves.

<p>False (B)</p> Signup and view all the answers

The pelvic splanchnic nerves supply sympathetic innervation to the hindgut.

<p>False (B)</p> Signup and view all the answers

The vagus nerves are traditionally said to supply parasympathetic innervation to the abdominal viscera as far as the distal transverse colon.

<p>True (A)</p> Signup and view all the answers

The hepatic branch of the anterior vagal trunk innervates the liver and the gallbladder.

<p>True (A)</p> Signup and view all the answers

Anaesthesia or ablation of the coeliac plexus is sometimes undertaken to treat medically intractable pain from cardiac disorders.

<p>False (B)</p> Signup and view all the answers

The intermesenteric plexus is a well-defined, discrete structure within the abdominal aortic autonomic plexus.

<p>False (B)</p> Signup and view all the answers

The ureteric, ovarian/testicular, and common iliac nerve plexuses receive branches from the superior hypogastric plexus.

<p>True (A)</p> Signup and view all the answers

The inferior hypogastric plexus supplies the ovary, uterine tubes, uterus, cervix of the uterus and vagina in females, and the urinary bladder and distal ureter in both sexes.

<p>True (A)</p> Signup and view all the answers

Para-aortic bodies are most commonly found as large, singular structure lying anterolateral to the abdominal aorta.

<p>False (B)</p> Signup and view all the answers

Valves are present in the hepatic portal vein in adults.

<p>False (B)</p> Signup and view all the answers

Match each nerve with its primary effect on visceral smooth muscle motility and glandular secretions:

<p>Sympathetic nerves = Inhibit motility and secretions Parasympathetic nerves = Increase motility and secretions Greater thoracic splanchnic nerve = Supply to the coeliac ganglion Pelvic splanchnic nerves = Motor to the smooth muscle of the hindgut and the wall of the urinary bladder</p> Signup and view all the answers

Match the following structures that transmit between the thorax and abdomen with their contents:

<p>Caval foramen = Inferior vena cava and right phrenic nerve Esophageal hiatus = Esophagus, vagal trunks, and vessels Aortic hiatus = Aorta, thoracic duct, and azygos vein Crura of the diaphragm = Thoracic splanchnic nerves</p> Signup and view all the answers

Match the ganglia to the nerves contributing to them:

<p>Coeliac ganglion = Greater and lesser thoracic splanchnic nerves, vagal trunks Aorticorenal ganglion = Lesser thoracic splanchnic nerve Renal plexus = Least thoracic splanchnic nerve Superior hypogastric plexus = Lumbar splanchnic nerves, pelvic splanchnic nerves</p> Signup and view all the answers

Match the following paired arteries of abdominal wall to their regions:

<p>Superior epigastric arteries = Anterior abdominal wall superiorly Inferior epigastric arteries = Anterior abdominal wall inferiorly Lumbar arteries = Posterior abdominal wall Superior and inferior gluteal arteries = posterior abdominal wall lateral</p> Signup and view all the answers

Match each abdominal region which its respective organs:

<p>Right hypochondriac region = Liver, gallbladder Epigastric region = Stomach Left hypochondriac region = Spleen Umbilical region = small intestine</p> Signup and view all the answers

Match the following structures derived from neural crest with their roles:

<p>Enteric Neurons = Regulation of gut motility Chromaffin cells of the para-aortic bodies = Secretion certain hormones Celiac Ganglia = Relay station for preganglionic fibers. Interstitial cells of Cajal (ICCs) = Creating signals.</p> Signup and view all the answers

Match these different tissue/membrane in digestive tract:

<p>Mucosa = absorption submucosa = Supplies dense arterial network Muscularis externa = Create peristalsis for movement of ingested material through hollow viscus Serosa/Adventitia = Provides covering on muscularis externa.</p> Signup and view all the answers

Relate artery supply of abdominal regions:

<p>Coeliac trunk = Foregut derivatives superior mesenteric artery = Midgut derivatives inferior mesenteric artery. = Hindgut derivatives Renal Arteries = Kidneys</p> Signup and view all the answers

Match types of nerve fibers to their targets:

<p>Afferent = Respond to mechanical and chemical stimuli. Efferent nerves = Innervate epithelial cells Interneurons = Relay and integrate signals. Sympathetic = Targets for the myenteric.</p> Signup and view all the answers

Relate venous return from spleen in following way:

<p>Splenic vein joins to the superior mesenteric vein = Hepatic portal vein Hepatic portal vein joints duodenum bile duct = Lesser omentum hepatic sinusoids where blood drain = Central Veins Central veins merges together = Hepatic Veins</p> Signup and view all the answers

Flashcards

Abdominopelvic Cavity Function

Houses/protects digestive, urinary, reproductive organs. Conduit for neurovascular communication. Supports posture and movement and gestation.

Abdominopelvic Cavity Walls

Lumbar vertebrae, abdominal wall muscles, pelvic basin, pelvic diaphragm, perineum, and respiratory diaphragm.

Principal Pathways Across Diaphragm

Caval foramen, esophageal hiatus, and aortic hiatus.

Pelvic Function

Transmits weight, stabilizes movement, attaches muscles of buttock/thigh, provides pathway for neurovascular structures.

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Autonomic Supply to Abdominopelvis

Sympathetic trunk and splanchnic nerves, vagus and pelvic splanchnic nerves.

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Sympathetic Effects

Inhibits visceral smooth muscle, induces sphincter contraction, causes vasoconstriction.

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Sympathetic Neurone Location

Lies in intermediolateral grey matter of T1-L2 spinal segments

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Paired Splanchnic Nerves

Greater, lesser, and least thoracic splanchnic nerves

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Greater Thoracic Splanchnic Origin

Derived from medial branches of T5-T9 thoracic ganglia.

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Lesser Thoracic Splanchnic Origin

Derived from medial branches of tenth and eleventh thoracic ganglia.

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Least Thoracic Splanchnic Origin

Derived from medial branches of eleventh and/or twelfth thoracic ganglion.

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Lumbar Sympathetic Trunk

Four ganglia on lumbar vertebrae near psoas major.

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Rami Communicantes

Connect lumbar ventral rami to sympathetic trunk.

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Lumbar Splanchnic Distribution

Four lumbar splanchnic nerves join coeliac, inferior mesenteric, and superior hypogastric plexuses.

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Sacral Sympathetic Trunk

Four/five ganglia medial to sacral foramina, forming ganglion impar.

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Pelvic Splanchnic Nerves

Second, third, and fourth sacral nerves.

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Coeliac Plexus

Located at T12-L1 level, surrounds coeliac trunk and proximal SMA.

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Coeliac Plexus Inputs

Greater, lesser thoracic splanchnic nerves, and vagal trunks.

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Superior Mesenteric Plexus

Lies posterior to pancreas, includes branches from vagal trunks and coeliac plexus.

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Intermesenteric Plexus

Located between the origins of SMA and IMA, connected to multiple other plexuses.

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Inferior Mesenteric Plexus

Lies around IMA origin, formed from aortic plexus, lumbar splanchnic nerves.

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Superior Hypogastric Plexus

Lies anterior to the aortic bifurcation and consists of branches from multiple sources.

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Inferior Hypogastric Plexus

Located on pelvic sidewall, formed from pelvic and sacral splanchnic nerves.

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Para-aortic Bodies

Collection of neural crest tissue near the abdominal aortic plexus.

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Major Abdominal Vessels

Inferior vena cava and abdominal aorta.

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Arterial Supply to Gastrointestinal Tract

Coeliac trunk, superior and inferior mesenteric arteries.

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Hepatic Portal System

Connects capillary beds of digestive tract/derived organs to hepatic sinusoids

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Hepatic Portal Vein Formation

Superior mesenteric and splenic veins.

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Hollow Viscera Layers

Four layers: mucosa, submucosa, muscularis externa, and serosa.

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Mucosa Subdivisions

Consists of epithelium, lamina propria, and muscularis mucosae.

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Epithelial Feature Function

Increases SA by mucosal folds, crypts, villi, microvilli.

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Lamina Propria Function

Loose connective tissue that Contains nutrients to the layer above.

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Connective/Muscle Tissue Arrangement

Submucosa has thick collagen, muscularis externa has inner circular and outer longitudinal layers.

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Muscularis Externa Actions

Propels contents aborally, mixes contents, or partitions segments.

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Pacemaker Cells

Interstitial Cells of Cajal (ICCs).

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Hollow Viscera Innervation

Enteric and autonomic nervous systems.

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Enteric Nervous System

Thousands of ganglia containing enteric neurones in myenteric and submucosal plexuses.

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Abdominal Planes

Paramedian: midclavicular to midinguinal. Horizontal: xiphisternal joint, transpyloric plane, subcostal plane, supracristal plane, intertubercular plane.

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Anterior Abdominal Landmarks

umbilicus is obvious where is the most superior point of the iliac crest on each side, for procedures.

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Thoracoabdominal Interface

The respiratory diaphragm separating the thoracic and abdominal cavities.

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Abdominal Wall Muscle Function

Movement of trunk (flexion, extension, rotation).

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Vagal Trunk Supply

Anterior vagal trunk mostly supplies the stomach directly and supplies the liver through the hepatic branch. Posterior vagal trunk sends Branches to the coeliac plexus.

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Pelvic Splanchnic Nerve Pathways

Pelvic viscera travel in S2-S4 ventral rami, forming a network towards the inferior hypogastric plexus, some joining the hypogastric nerves and ascending to the superior hypogastric plexus. A few run superolaterally to the sigmoid and descending colons.

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Pelvic Splanchnic Actions

Motor to hindgut smooth muscle and bladder wall, vasodilators to erectile tissues, secretomotor to hindgut derivatives.

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Coeliac Ganglia Location

Irregular masses located from the coeliac trunk to the superior mesenteric artery adjacent to the suprarenal glands.

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Aorticorenal Ganglion Function

Receives lesser splanchnic nerve and gives rise to most the renal plexus.

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Phrenic Plexus Composition

Contains one/two ganglia, connects coeliac plexus, supplies suprarenal glands, respiratory diaphragm.

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Splanchnic Nerves

Sensory and Motor nerves for the hollow abdominal organs and viscera

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GI Tract Epithelium

Esophagus to anal canal. Epithelium for protection and secretion/absorption.

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Splanchnopleuric Mesoderm

Connective tissue, muscle layers, BVs, and lymphatics of the wall. External surface becomes visceral mesothelium.

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Enteric Reflexes

Local reflexes, prevertebral ganglia mediated reflexes and central nervous system mediated reflexes.

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Transpyloric Plane

Midway between the jugular notch and pubic symphysis, intersecting L1-L2.

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Intertubercular Plane

Joining iliac tubercles at L5. Landmark for IVC origin.

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Supracristal Plane

Joining the most superior point of the iliac crest, where an injection is performed.

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Ninth Distal Border

A tender 'step' which you can feel is along the costal arch

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Midinguinal Point

Midpoint between pubic symphysis and anterior superior iliac spine, the femoral artery, deep inguinal ring.

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Cremasteric Reflex

Striking the skin of the most medial side of the thigh elevates ipsilateral testis.

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Superficial Abdominal Reflex

Limited significance helps locate lesions in the spine but hard to elicit in obese patients.

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McBurney's point

Located at the level T1 to L5 and is used to position an incision

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Pelvis-Lower Limb Interface

Important for hip joint movement and walking

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Sympathetic Actions

Inhibits visceral muscle, contracts sphincters, causes vasoconstriction

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Parasympathetic Location

Cell bodies in vagus nerve or S2-S4 spinal cord segments

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Abdominopelvic Plexuses

Encircle the aorta with adjacent connections

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Coeliac Trunk Supply

Supplies foregut (esophagus to duodenum) and associated viscera

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Superior Mesenteric Supply

From mid-duodenum to distal transverse colon

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Inferior Mesenteric Supply

From distal transverse colon to proximal anal canal

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Hepatic Portal Vein

Junction of superior mesenteric and splenic veins

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GI Tract Wall

Modified region of the GI tract for local needs

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Mucosal Folds Function

Increase surface area for secretion or absorption

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Muscularis Externa Activity

Slow waves spread, causing contraction

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Afferent Neurones

Detect local stretch for the peristaltic reflex

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Linea terminalis

The anterior superior iliac spines and pubic tubercles

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Coeliac Plexus Function

Drains pain sensation from proximal GI organs and visceral afferent fibres.

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Nine Regions

Four regions based on skeletal landmarks and planes

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Abdominal Cavity Shape

Kidney-shaped due to vertebral column indentation.

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Rules of Sympathetic Neurones

Autonomic system inhibits smooth muscle/glandular action but stimulates sphincter contraction/vasoconstriction.

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Grey rami communicantes

Contain postganglionic sympathetic nerves to spinal nerves with no white rami at the level.

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Nerve branches

Innervates ABD, Pelvis and other structures

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Nerve Functions

Hypogastric: contains Symp and Parasympathetic, runs superiorly into the plexus

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Superior hypogastric plexus position

Located within extraperitoneal tissue

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Autonomic structures

These pass via the aortic hiatus in the diaphragm

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Subcostal vessels

These vessels pass abdominally

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Lumbar Sympathetic Trunk Inferiorly

Posterior to the common iliac vessels and is continuous with the sacral part

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Hepatic Branch

The anterior vagal trunk gives off this Branch

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Nerves to the cutaneous branches

Sympathetic branches to skin

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Linea terminalis Angle

Angle of the linea terminalis relative to horizontal when standing.

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Sacral Angle

Angle of the first segment of the sacrum to the horizontal plane.

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Interval Deep to Inguinal Ligament

Transmit the femoral neurovascular structures and lymphatics.

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Sciatic Foramina

Transmit the gluteal vessels and nerves, sciatic nerve and internal pudendal vessels and pudendal nerve.

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Obturator Foramen

Transmits the obturator nerve, vessels and lymphatics.

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Paramedian Lines

Run vertically, pass from the midclavicular point to a point midway between the anterior superior iliac spine and the pubic symphysis.

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Subcostal Plane Definition

Joins lowest point of the costal arch on each side.

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Tendinous Intersections

In the thin, muscular individual, these are often visible when contracted.

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Midinguinal Point Location

Contains vessels going into lower limb

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Study Notes

  • The abdomen and pelvis form the largest continuous visceral cavity in the body
  • They provide multiple vital functions such as housing and protecting the:
    • Digestive tract
    • Urinary tract
    • Internal reproductive organs
  • Other functions of the abdominopelvic cavity include:
    • Conduit for neurovascular communication between the thorax and lower limb
    • Support, and point of attachment for the external genitalia
    • Facilitating access to and from the internal reproductive organs and urinary tract
    • Assistance with physiological functions such as respiration, defecation, and micturition
    • Support for the vertebral column in weight-bearing, maintenance of posture and movement
    • Support of gestation in females
  • (Fig 59.1) The walls of the abdominopelvic cavity consist of:
    • Five lumbar vertebrae and their intervening intervertebral discs (lying in the posterior midline)
    • The muscles of the anterior abdominal wall lying anteriorly (rectus abdominis) and anterolaterally (transversus abdominis, internal abdominal oblique, and external abdominal oblique)
    • The muscles of the posterior abdominal wall (psoas major, quadratus lumborum, and the respiratory diaphragm)
    • The bony 'basin' formed by the walls of the greater and lesser pelves
    • The muscles of the pelvic diaphragm and perineum lying inferiorly
    • The respiratory diaphragm lying superiorly
  • The superior aspect of the abdominal cavity gains protection from the inferior six ribs and their cartilages
  • Abdominal wall muscles are important for trunk movement, including flexion, extension, and rotation
  • Anterolateral muscles provide assistance with thorax rotation in relation to the pelvis, or vice versa if the thorax is fixed
  • The abdominal cavity is kidney-shaped in horizontal cross-section due to the vertebral column's posterior indentation
  • In a standing position, the linea terminalis lies at about 55° to the horizontal
    • This is where the anterior superior iliac spines and pubic tubercles lie in approximately the same coronal plane
  • (Ch. 55) The respiratory diaphragm, also called the thoracic diaphragm, is the interface between the thoracic and abdominal cavities
  • There are three principal pathways between the two cavities across the respiratory diaphragm:
    • The caval foramen in the central tendon transmits the inferior vena cava and right phrenic nerve
    • The oesophageal hiatus, encircled by the right crus of the respiratory diaphragm, transmits the oesophagus, vagal trunks, and vessels
    • The aortic hiatus, posterior to the median arcuate ligament, transmits the aorta, thoracic duct, and, usually, the azygos vein
  • The hemiazygos vein usually enters the thorax through the left crus of the respiratory diaphragm
  • Lymphatics from the abdomen drain to the thorax alongside the inferior vena cava and via small vessels passing through and around the respiratory diaphragm
  • Thoracic splanchnic nerves reach the abdomen through the crura of the respiratory diaphragm and posterior to the medial arcuate ligaments
  • The left phrenic nerve pierces the left side of the respiratory diaphragm
  • Subcostal vessels pass into the abdomen posterior to the lateral arcuate ligaments of the respiratory diaphragm
  • The superior epigastric vessels pass anteriorly between the costal and xiphoid process attachments, i.e. sternocostal foramen of the respiratory diaphragm
  • Neurovascular structures also cross between the thorax and abdomen within the subcutaneous tissues
  • The pelvis transmits the weight of the upright body and provides a stable platform for movement of the hip joint and bipedal locomotion
  • Attachment sites on the bony surfaces to muscles of the buttock and thigh (Ch. 77), the pelvic diaphragm and perineal membrane, and the abdominal wall and lower back.
  • Neurovascular structures that supply the lower limb are also transmitted by the pelvis
  • The four principal pathways between the pelvis and lower limb:
    • The interval deep to the inguinal ligament anterior to the superior ramus of the pubis and ilium, transmits the femoral neurovascular structures and lymphatics
    • Greater and lesser sciatic foramina transmits the gluteal vessels and nerves, sciatic nerve and internal pudendal vessels and pudendal nerve
    • The obturator foramen transmits the obturator nerve, vessels and lymphatics
  • Autonomic nerves travel with the arterial supply to the lower limb and with the branches of the sacral plexus.
  • Neurovascular structures cross between the lower limb and pelvis within the subcutaneous tissues

Musculoskeletal Framework

  • (Woon et al 2013) The mean angle between the superior border of the first sacral segment and the horizontal plane is about 40-45°

Neurovascular System

  • The abdominopelvic autonomic supply to the abdominal and pelvic viscera passes via the abdominopelvic portions of the sympathetic trunk along with more major nerves
  • Descriptions are simplifications based on the main supply to each organ.

sympathetic trunk

  • Greater, lesser and least thoracic splanchnic nerves (sympathetic)
  • Vagus and pelvic splanchnic nerves (parasympathetic)
  • sympathetic neurones from the abdominopelvic autonomic plexuses generally:
    • Inhibit visceral smooth muscle motility
    • Glandular secretions
    • They induce sphincter contraction
    • Cause vasoconstriction
  • Parasympathetic stimulation leads to opposing effects.
  • Visceral afferents also pass through these autonomic plexuses

Sympathetic Innervation

  • Neurone cell bodies of the sympathetic supply of the abdomen and pelvis lie in the intermediolateral grey matter of the first to twelfth thoracic and first two lumbar spinal segments
  • Myelinated axons from these neurones travel in the ventral ramus of the spinal nerve of the same segmental level, leaving it via a white ramus communicans to enter a thoracic or lumbar ganglion
  • Visceral branches can exit at the same level or ascend or descend several levels in the sympathetic trunk before exiting
  • These Visceral Branches leave the ganglia without synapsing and pass medially, giving rise to the paired:
    • Greater
    • Lesser
    • Least thoracic splanchnic nerves and to the lumbar and sacral splanchnic nerves.
  • Axons destined to supply somatic structures synapse in the sympathetic ganglion of the same level- Postganglionic, unmyelinated axons leave the ganglion as one or more grey rami communicantes which enter the spinal nerve of the same segmental level

Greater Thoracic Splanchnic Nerve

  • It is derived from the medial branches of the fifth to ninth thoracic ganglia, giving off branches to the descending thoracic aorta
  • The nerve enters the abdomen through the fibres of the ipsilateral crus of the respiratory diaphragm, on which it descends anteroinferiorly
  • The main trunk of the nerve enters the superior aspect of the coeliac ganglion, where most of the preganglionic fibres synapse

Lesser Thoracic Splanchnic Nerve

  • It derives from the medial branches of the tenth and eleventh thoracic ganglia.
  • It runs through the most inferior fibers to the ipisilateral crus of reps Diaphragm of medial arcuate connects to Coeliac Ganglion

Lumbar Sympathetic System

  • (Murata et al 2003) supported that superiorly, the lumbar sympathetic trunk, is continuous with the thoracic part of the sympathetic trunk posterior to the medial arcuate ligament.
  • (Murata et al 2003) confirmed that inferiorly, the lumbar sympathetic trunk, which passes posterior to the common iliac vessels, is continuous with the sacral part of the sympathetic trunk.
  • Superiorly
    • Right Side lies posterior to the inferior vena cava
    • Left Side lies posterior to the lateral aortic nodes
  • The trunk is anterior to lumbar vessels but may pass posterior to some lumbar trunk

Internal Lumbar Ganglia

  • The lumbar part of each sympathetic trunk usually contains four ganglia.
  • 1st, 2nd and sometimes the 3rd lumbar ventral rami connected to the lumbar part of the sympathetic trunk by white rami communicantes
  • Arrangement Irregular Each lumbar ganglia has rami to 2/3 lumbar ventral rami
  • arrangement irregular lumber vental rami has rami from two ganglia
  • arrangement irregular rami can leave between ganglia

Somatic and Vascular Branches

  • Found the nerves accompany the lumbar arteries connecting them to side of the vertebral bodies medial to fibrous arches to provide sympathetic innervation

Lumbar Splanchnic Nerves

  • They number 4 and reach the Coeliac, inferior mesenteric and hypogastric plexus.
  • The first runs to coeliac, renal and inferior.
  • Second connects to inferior Mesenteric.
  • Third connects to superior hypo plexus.
  • Fourth Connects to distal part or hypo Nerve

Pelvic Sympathetic System

  • The sacral sympathetic trunk usually consists of four or five ganglia located medial or anterior to the anterior sacral foramina posterior to the presacral fascia
  • Continuous above with the lumbar part of the sympathetic trunk, and preganglionic fibers descend from the distal lumbar spinal cord segments via this root
  • The first sacral ganglion is the largest but becomes progressively smaller in the caudal direction
  • The sacral sympathetic trunk is often asymmetric, with absent or fused ganglia, and cross-communications between sides are frequent
  • Each ganglion sends at least one grey ramus communicans to its adjacent spinal nerve but as many as 11 have been reported per ganglion

Ganglion impar

  • Sacral part converges caudally to form a solitary retroperitoneal structure
  • Lies variable between the Sacrococcygeal joint and coccyx apex
  • The Ganglion Impar can be paired, unilateral or even absent
  • Ganglion Impar coveys sympathetic fibres to nociceptive afferents and perineum and terminal urogenital regions
  • Anaesthetic Blockade can treat intractable perineal pain visceral afferent from pelvic cancers
  • (Horn 2018) challenged that experimental study of the differential expression of transcription factors in embryonic mice arguing that thoracic and sacral pools of preganglionic neurones share a common sympathetic identity and that the sacral autonomic outflow should therefore be regarded as sympathetic (Espinosa-Medina et al 2016).

Parasympathetic Innervation

  • The parasympathetic neurones innervating the abdomen and pelvis lie in the posterior nucleus of the vagus nerve or in the intermediolateral grey matter of the second, third, and fourth sacral spinal cord segments
  • Traditionally, vagus nerves supply parasympathetic innervation abdominal viscera to distal transverse
  • Traditionally, Hindgut is supplied by travelling pelvic splanchnic never
  • The descriptions tend to be simplifications based on the main supply to each organ.

Pelvic Splanchnic Nerves

  • Travel the ventricle rami of the 2, 3 and 4sacral spinal nerves
  • Exit the nerves at anterior sacral foramina passing in tissue as fiber network for destination.
  • Most antrolateral pass with network that form Inferior hypogastric plexus pass to pelvis
  • Some Directly link hypogastric nerves reaching inferior mesenteric

Abdominopelvic Autonomic Plexuses

  • (Figs 59.3–4) are variable- Fusion/ interrelated

Coeliac Plexus

  • Is on the 12th thoracic and 1 Lumbar levels
  • Is Network that connect coeliac ganglia- surrounds coeliac trunk proximal superior Mesenteric artery
  • Posterior to Stomach / omental bursae and anterior to crura of reps, diaphragm, beginning o abdominal aorta
  • Is joined to vagal trunk plexes
  • Connected to phernic, splenic, hepatic, suprarenal, Renal and other areas (Visceral afferent)
  • Anesthesia or ablation can treat intractable pain from pancreatic disorder

Skeletal Landmarks

  • It was detailed Mirjalili et al 2012a,Uzun et al 2016, that the plane sits more superiorly in males.
  • It is also shown the transverse spinous L5 passes to plane.

Vertical lines and planes

  • The midline crosses through the xiphoid process/ pubic symphysis. -The Paramedian lines run midclaricular to point midway-ASIS and Pubic areas.

Soft tissue Landmarks

  • The linea alba obvious landmark with Relatively inconstant position.
  • The information detailed (Mirjalili et al 2012b, Shen et al 2016) related to position of the umbilicus in the supine adult was supported.
  • It can indicated at the (Mirjalili et al 2012b, Shen et al 2016) that more inferior level the obese and children, and in adults found also a distal abdominal wall.

Intra abdominal Viscera

  • At both inspiration and normal resp, the inferior border is from right 10th space Inferior border in hypochondriac, or (distal hypogastric can be palpable)
  • From supine individuals found that the spleen Mirjalili et al 2012b, Shen et al 2016 sits deep to the tenth to the twelfth ribs in 50% of subjects and deep to the ninth to elev-enth ribs in 25%, with its long axis aligning most closely with either the eleventh or tenth rib, respectively.
  • The vertebral limits of the Mirjalili et al 2012b vertebrae are between the vertebral bodies of T12 and L3 or L4, while those for the right kidney are between the vertebral bodies of L1 and L4 (range, superior half of the vertebral body of T11 to inferior half of the vertebral body of L5) - (see Fig. 59.10D)
  • In children the spleen Subramaniam et al 2016 is often in a more superior location, with its long axis aligning with -ninth

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