Podcast
Questions and Answers
Which feature is NOT a primary component of the abdominopelvic cavity's role in supporting overall body function?
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?
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?
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?
How might variations in the course or connectivity of thoracic splanchnic nerves impact surgical interventions in the abdomen?
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?
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?
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?
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?
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?
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?
What anatomical arrangement enables the performance of coeliac plexus blockade for pancreatic cancer pain relief, and what visceral afferent fibres are targeted?
What anatomical arrangement enables the performance of coeliac plexus blockade for pancreatic cancer pain relief, and what visceral afferent fibres are targeted?
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?
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?
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?
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?
How does the histological composition of the oesophagus differ from that of the small intestine in relation to protection and function?
How does the histological composition of the oesophagus differ from that of the small intestine in relation to protection and function?
Where would one MOST reliably palpate the abdominal aorta to compress it against the vertebral column and why?
Where would one MOST reliably palpate the abdominal aorta to compress it against the vertebral column and why?
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?
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?
Which surface landmark would be MOST suitable for estimating the location of the renal hila in a supine adult when planning a percutaneous nephrostomy?
Which surface landmark would be MOST suitable for estimating the location of the renal hila in a supine adult when planning a percutaneous nephrostomy?
What anatomical relationship is MOST relevant when performing a suprapubic catheterization, and how does bladder filling affect this relationship?
What anatomical relationship is MOST relevant when performing a suprapubic catheterization, and how does bladder filling affect this relationship?
Why is knowledge of precise anatomical relationships important in laparoscopic surgery, and specifically, when inserting trocars through the anterior abdominal wall?
Why is knowledge of precise anatomical relationships important in laparoscopic surgery, and specifically, when inserting trocars through the anterior abdominal wall?
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?
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?
During a paracentesis, which abdominal layer/anatomical consideration would be MOST important in reducing the risk of complications?
During a paracentesis, which abdominal layer/anatomical consideration would be MOST important in reducing the risk of complications?
In the context of surface anatomy, what makes Tuffier's line especially clinically relevant for procedures such as lumbar punctures?
In the context of surface anatomy, what makes Tuffier's line especially clinically relevant for procedures such as lumbar punctures?
In which clinical situation might knowledge of the semilunar (Spigelian) line prove MOST useful for diagnosis or surgical planning?
In which clinical situation might knowledge of the semilunar (Spigelian) line prove MOST useful for diagnosis or surgical planning?
In assessing anterior abdominal wall during muscle tension, what is the anatomical significance used for identifying the rectus abdominis muscle's position
In assessing anterior abdominal wall during muscle tension, what is the anatomical significance used for identifying the rectus abdominis muscle's position
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?
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?
In a surgical scenario where the first lumbar splanchnic nerve is inadvertently damaged, what specific consequence is MOST likely to occur?
In a surgical scenario where the first lumbar splanchnic nerve is inadvertently damaged, what specific consequence is MOST likely to occur?
What is the MOST critical anatomical consideration for a surgeon performing a coeliac plexus blockade to manage pain from pancreatic cancer?
What is the MOST critical anatomical consideration for a surgeon performing a coeliac plexus blockade to manage pain from pancreatic cancer?
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?
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?
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?
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?
In the context of a laparoscopic appendectomy, what is the MOST relevant anatomical implication of the variable position of the appendix?
In the context of a laparoscopic appendectomy, what is the MOST relevant anatomical implication of the variable position of the appendix?
What is the MOST critical anatomical consideration when performing a suprapubic catheterization to minimize iatrogenic injury?
What is the MOST critical anatomical consideration when performing a suprapubic catheterization to minimize iatrogenic injury?
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?
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?
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?
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?
During a retroperitoneal approach for a nephrectomy, what anatomical structure serves as the MOST reliable landmark for identifying the renal hilum?
During a retroperitoneal approach for a nephrectomy, what anatomical structure serves as the MOST reliable landmark for identifying the renal hilum?
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?
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?
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?
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?
What anatomical variation should a surgeon consider when mobilizing the splenic flexure during a colectomy, considering potential impacts on vascular supply?
What anatomical variation should a surgeon consider when mobilizing the splenic flexure during a colectomy, considering potential impacts on vascular supply?
How would damage to the pelvic splanchnic nerves during a surgical procedure such as a radical prostatectomy MOST directly manifest clinically?
How would damage to the pelvic splanchnic nerves during a surgical procedure such as a radical prostatectomy MOST directly manifest clinically?
What BEST describes the relationship between the respiratory diaphragm and the thoracic splanchnic nerves as they traverse to the abdomen?
What BEST describes the relationship between the respiratory diaphragm and the thoracic splanchnic nerves as they traverse to the abdomen?
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?
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?
During a right hemicolectomy, what anatomical structure, if inadvertently injured, would MOST significantly disrupt venous drainage from the small intestine and associated structures?
During a right hemicolectomy, what anatomical structure, if inadvertently injured, would MOST significantly disrupt venous drainage from the small intestine and associated structures?
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?
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?
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?
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?
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?
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?
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?
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?
If a surgeon uses Tuffier's line during a lumbar puncture, what anatomical structure does it reference, and how does this positioning prevent complications?
If a surgeon uses Tuffier's line during a lumbar puncture, what anatomical structure does it reference, and how does this positioning prevent complications?
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?
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?
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?
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?
Which aspect of the abdominopelvic cavity's function is MOST compromised if the vertebral column loses its normal curvature?
Which aspect of the abdominopelvic cavity's function is MOST compromised if the vertebral column loses its normal curvature?
Damage to the fibres of the ipsilateral crus of the respiratory diaphragm during a surgical procedure is MOST likely to directly impact which structure?
Damage to the fibres of the ipsilateral crus of the respiratory diaphragm during a surgical procedure is MOST likely to directly impact which structure?
Which anatomical structure is MOST likely to be compromised if a surgical procedure inadvertently damages the median arcuate ligament?
Which anatomical structure is MOST likely to be compromised if a surgical procedure inadvertently damages the median arcuate ligament?
If a patient experiences impaired weight transmission and instability following a pelvic fracture, which anatomical interface is PRIMARILY affected?
If a patient experiences impaired weight transmission and instability following a pelvic fracture, which anatomical interface is PRIMARILY affected?
Which autonomic response is MOST likely to be observed, if the sympathetic trunk is stimulated?
Which autonomic response is MOST likely to be observed, if the sympathetic trunk is stimulated?
What is the MOST likely outcome of disrupting the white ramus communicantes at the L1 spinal segment?
What is the MOST likely outcome of disrupting the white ramus communicantes at the L1 spinal segment?
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?
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?
What visceral effect is MOST likely to result from surgical damage to the sacral splanchnic nerves?
What visceral effect is MOST likely to result from surgical damage to the sacral splanchnic nerves?
What is the MOST likely consequence of selectively blocking the coeliac plexus?
What is the MOST likely consequence of selectively blocking the coeliac plexus?
What is the MOST likely result of disrupting the vagal trunks as they enter the abdomen through the oesophageal hiatus?
What is the MOST likely result of disrupting the vagal trunks as they enter the abdomen through the oesophageal hiatus?
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?
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?
What is the functional significance of the microvilli found on the epithelium of the small intestine?
What is the functional significance of the microvilli found on the epithelium of the small intestine?
What effect do stimulating the muscularis mucosae have on the stomach and large intestine?
What effect do stimulating the muscularis mucosae have on the stomach and large intestine?
What is the MOST likely clinical consequence of extensive damage to the myenteric plexus?
What is the MOST likely clinical consequence of extensive damage to the myenteric plexus?
What functional change would be MOST expected following the selective ablation of interstitial cells of Cajal (ICCs) in the gastrointestinal tract?
What functional change would be MOST expected following the selective ablation of interstitial cells of Cajal (ICCs) in the gastrointestinal tract?
What is the MOST likely effect of applying firm pressure along the midline to compress the abdominal aorta against the lumbar vertebrae?
What is the MOST likely effect of applying firm pressure along the midline to compress the abdominal aorta against the lumbar vertebrae?
In the absence of clear external landmarks, what anatomical feature is MOST useful for locating the transpyloric plane?
In the absence of clear external landmarks, what anatomical feature is MOST useful for locating the transpyloric plane?
What is the MOST clinically relevant implication of identifying Tuffier's line (supracristal plane) during a lumbar puncture?
What is the MOST clinically relevant implication of identifying Tuffier's line (supracristal plane) during a lumbar puncture?
What is the MOST clinically significant anatomical implication of the linea alba's structure in abdominal surgeries?
What is the MOST clinically significant anatomical implication of the linea alba's structure in abdominal surgeries?
During a laparoscopic surgery, what anatomical knowledge is MOST critical for safe trocar insertion to avoid injury to the inferior epigastric artery?
During a laparoscopic surgery, what anatomical knowledge is MOST critical for safe trocar insertion to avoid injury to the inferior epigastric artery?
What anatomical characteristic of the rectus abdominis muscle is MOST leveraged when creating an intestinal stoma to reduce the risk of herniation?
What anatomical characteristic of the rectus abdominis muscle is MOST leveraged when creating an intestinal stoma to reduce the risk of herniation?
What anatomical relationship should be accounted for when performing a suprapubic catheterization?
What anatomical relationship should be accounted for when performing a suprapubic catheterization?
What surgical approach is BEST applied when performing a cholecystectomy?
What surgical approach is BEST applied when performing a cholecystectomy?
How does a surgeon account for a kidney's movement, if moving from lying to standing during operation?
How does a surgeon account for a kidney's movement, if moving from lying to standing during operation?
What is the best method to define the transpyloric plane?
What is the best method to define the transpyloric plane?
If a surgeon is approaching a kidney for surgical observation, where should the approach occur?
If a surgeon is approaching a kidney for surgical observation, where should the approach occur?
While performing surface examination on the duodenum, what orientation is MOST effective?
While performing surface examination on the duodenum, what orientation is MOST effective?
When viewing abdominal wall structures, what orientation corresponds to the vessels?
When viewing abdominal wall structures, what orientation corresponds to the vessels?
The abdominal cavity has a perfectly circular shape in horizontal cross-section.
The abdominal cavity has a perfectly circular shape in horizontal cross-section.
The aortic hiatus transmits the aorta, thoracic duct, and azygos vein.
The aortic hiatus transmits the aorta, thoracic duct, and azygos vein.
The pelvis only functions as part of the lower limbs and not the abdominopelvic cavity.
The pelvis only functions as part of the lower limbs and not the abdominopelvic cavity.
Autonomic nerves always travel independently and are not associated with the arterial supply to the lower limb.
Autonomic nerves always travel independently and are not associated with the arterial supply to the lower limb.
Sympathetic stimulation of visceral smooth muscle motility generally inhibits it.
Sympathetic stimulation of visceral smooth muscle motility generally inhibits it.
The greater thoracic splanchnic nerve is derived from the medial branches of the fifth to ninth thoracic ganglia.
The greater thoracic splanchnic nerve is derived from the medial branches of the fifth to ninth thoracic ganglia.
The coeliac ganglion primarily synapses the preganglionic fibres destined for the adrenal medulla.
The coeliac ganglion primarily synapses the preganglionic fibres destined for the adrenal medulla.
The lumbar part of the sympathetic trunk typically consists of six ganglia lying on the anterolateral aspects of the lumbar vertebrae.
The lumbar part of the sympathetic trunk typically consists of six ganglia lying on the anterolateral aspects of the lumbar vertebrae.
Lumbar splanchnic nerves exclusively innervate the wall of the digestive organs.
Lumbar splanchnic nerves exclusively innervate the wall of the digestive organs.
The ganglion impar is a paired retroperitoneal structure formed by the convergence of the sacral sympathetic trunks.
The ganglion impar is a paired retroperitoneal structure formed by the convergence of the sacral sympathetic trunks.
White rami communicantes are present at the level of the sacral spinal nerves.
White rami communicantes are present at the level of the sacral spinal nerves.
The pelvic splanchnic nerves supply sympathetic innervation to the hindgut.
The pelvic splanchnic nerves supply sympathetic innervation to the hindgut.
The vagus nerves are traditionally said to supply parasympathetic innervation to the abdominal viscera as far as the distal transverse colon.
The vagus nerves are traditionally said to supply parasympathetic innervation to the abdominal viscera as far as the distal transverse colon.
The hepatic branch of the anterior vagal trunk innervates the liver and the gallbladder.
The hepatic branch of the anterior vagal trunk innervates the liver and the gallbladder.
Anaesthesia or ablation of the coeliac plexus is sometimes undertaken to treat medically intractable pain from cardiac disorders.
Anaesthesia or ablation of the coeliac plexus is sometimes undertaken to treat medically intractable pain from cardiac disorders.
The intermesenteric plexus is a well-defined, discrete structure within the abdominal aortic autonomic plexus.
The intermesenteric plexus is a well-defined, discrete structure within the abdominal aortic autonomic plexus.
The ureteric, ovarian/testicular, and common iliac nerve plexuses receive branches from the superior hypogastric plexus.
The ureteric, ovarian/testicular, and common iliac nerve plexuses receive branches from the superior hypogastric plexus.
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.
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.
Para-aortic bodies are most commonly found as large, singular structure lying anterolateral to the abdominal aorta.
Para-aortic bodies are most commonly found as large, singular structure lying anterolateral to the abdominal aorta.
Valves are present in the hepatic portal vein in adults.
Valves are present in the hepatic portal vein in adults.
Match each nerve with its primary effect on visceral smooth muscle motility and glandular secretions:
Match each nerve with its primary effect on visceral smooth muscle motility and glandular secretions:
Match the following structures that transmit between the thorax and abdomen with their contents:
Match the following structures that transmit between the thorax and abdomen with their contents:
Match the ganglia to the nerves contributing to them:
Match the ganglia to the nerves contributing to them:
Match the following paired arteries of abdominal wall to their regions:
Match the following paired arteries of abdominal wall to their regions:
Match each abdominal region which its respective organs:
Match each abdominal region which its respective organs:
Match the following structures derived from neural crest with their roles:
Match the following structures derived from neural crest with their roles:
Match these different tissue/membrane in digestive tract:
Match these different tissue/membrane in digestive tract:
Relate artery supply of abdominal regions:
Relate artery supply of abdominal regions:
Match types of nerve fibers to their targets:
Match types of nerve fibers to their targets:
Relate venous return from spleen in following way:
Relate venous return from spleen in following way:
Flashcards
Abdominopelvic Cavity Function
Abdominopelvic Cavity Function
Houses/protects digestive, urinary, reproductive organs. Conduit for neurovascular communication. Supports posture and movement and gestation.
Abdominopelvic Cavity Walls
Abdominopelvic Cavity Walls
Lumbar vertebrae, abdominal wall muscles, pelvic basin, pelvic diaphragm, perineum, and respiratory diaphragm.
Principal Pathways Across Diaphragm
Principal Pathways Across Diaphragm
Caval foramen, esophageal hiatus, and aortic hiatus.
Pelvic Function
Pelvic Function
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Autonomic Supply to Abdominopelvis
Autonomic Supply to Abdominopelvis
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Sympathetic Effects
Sympathetic Effects
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Sympathetic Neurone Location
Sympathetic Neurone Location
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Paired Splanchnic Nerves
Paired Splanchnic Nerves
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Greater Thoracic Splanchnic Origin
Greater Thoracic Splanchnic Origin
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Lesser Thoracic Splanchnic Origin
Lesser Thoracic Splanchnic Origin
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Least Thoracic Splanchnic Origin
Least Thoracic Splanchnic Origin
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Lumbar Sympathetic Trunk
Lumbar Sympathetic Trunk
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Rami Communicantes
Rami Communicantes
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Lumbar Splanchnic Distribution
Lumbar Splanchnic Distribution
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Sacral Sympathetic Trunk
Sacral Sympathetic Trunk
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Pelvic Splanchnic Nerves
Pelvic Splanchnic Nerves
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Coeliac Plexus
Coeliac Plexus
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Coeliac Plexus Inputs
Coeliac Plexus Inputs
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Superior Mesenteric Plexus
Superior Mesenteric Plexus
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Intermesenteric Plexus
Intermesenteric Plexus
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Inferior Mesenteric Plexus
Inferior Mesenteric Plexus
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Superior Hypogastric Plexus
Superior Hypogastric Plexus
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Inferior Hypogastric Plexus
Inferior Hypogastric Plexus
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Para-aortic Bodies
Para-aortic Bodies
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Major Abdominal Vessels
Major Abdominal Vessels
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Arterial Supply to Gastrointestinal Tract
Arterial Supply to Gastrointestinal Tract
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Hepatic Portal System
Hepatic Portal System
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Hepatic Portal Vein Formation
Hepatic Portal Vein Formation
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Hollow Viscera Layers
Hollow Viscera Layers
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Mucosa Subdivisions
Mucosa Subdivisions
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Epithelial Feature Function
Epithelial Feature Function
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Lamina Propria Function
Lamina Propria Function
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Connective/Muscle Tissue Arrangement
Connective/Muscle Tissue Arrangement
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Muscularis Externa Actions
Muscularis Externa Actions
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Pacemaker Cells
Pacemaker Cells
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Hollow Viscera Innervation
Hollow Viscera Innervation
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Enteric Nervous System
Enteric Nervous System
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Abdominal Planes
Abdominal Planes
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Anterior Abdominal Landmarks
Anterior Abdominal Landmarks
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Thoracoabdominal Interface
Thoracoabdominal Interface
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Abdominal Wall Muscle Function
Abdominal Wall Muscle Function
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Vagal Trunk Supply
Vagal Trunk Supply
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Pelvic Splanchnic Nerve Pathways
Pelvic Splanchnic Nerve Pathways
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Pelvic Splanchnic Actions
Pelvic Splanchnic Actions
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Coeliac Ganglia Location
Coeliac Ganglia Location
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Aorticorenal Ganglion Function
Aorticorenal Ganglion Function
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Phrenic Plexus Composition
Phrenic Plexus Composition
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Splanchnic Nerves
Splanchnic Nerves
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GI Tract Epithelium
GI Tract Epithelium
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Splanchnopleuric Mesoderm
Splanchnopleuric Mesoderm
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Enteric Reflexes
Enteric Reflexes
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Transpyloric Plane
Transpyloric Plane
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Intertubercular Plane
Intertubercular Plane
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Supracristal Plane
Supracristal Plane
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Ninth Distal Border
Ninth Distal Border
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Midinguinal Point
Midinguinal Point
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Cremasteric Reflex
Cremasteric Reflex
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Superficial Abdominal Reflex
Superficial Abdominal Reflex
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McBurney's point
McBurney's point
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Pelvis-Lower Limb Interface
Pelvis-Lower Limb Interface
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Sympathetic Actions
Sympathetic Actions
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Parasympathetic Location
Parasympathetic Location
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Abdominopelvic Plexuses
Abdominopelvic Plexuses
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Coeliac Trunk Supply
Coeliac Trunk Supply
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Superior Mesenteric Supply
Superior Mesenteric Supply
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Inferior Mesenteric Supply
Inferior Mesenteric Supply
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Hepatic Portal Vein
Hepatic Portal Vein
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GI Tract Wall
GI Tract Wall
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Mucosal Folds Function
Mucosal Folds Function
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Muscularis Externa Activity
Muscularis Externa Activity
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Afferent Neurones
Afferent Neurones
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Linea terminalis
Linea terminalis
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Coeliac Plexus Function
Coeliac Plexus Function
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Nine Regions
Nine Regions
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Abdominal Cavity Shape
Abdominal Cavity Shape
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Rules of Sympathetic Neurones
Rules of Sympathetic Neurones
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Grey rami communicantes
Grey rami communicantes
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Nerve branches
Nerve branches
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Nerve Functions
Nerve Functions
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Superior hypogastric plexus position
Superior hypogastric plexus position
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Autonomic structures
Autonomic structures
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Subcostal vessels
Subcostal vessels
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Lumbar Sympathetic Trunk Inferiorly
Lumbar Sympathetic Trunk Inferiorly
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Hepatic Branch
Hepatic Branch
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Nerves to the cutaneous branches
Nerves to the cutaneous branches
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Linea terminalis Angle
Linea terminalis Angle
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Sacral Angle
Sacral Angle
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Interval Deep to Inguinal Ligament
Interval Deep to Inguinal Ligament
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Sciatic Foramina
Sciatic Foramina
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Obturator Foramen
Obturator Foramen
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Paramedian Lines
Paramedian Lines
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Subcostal Plane Definition
Subcostal Plane Definition
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Tendinous Intersections
Tendinous Intersections
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Midinguinal Point Location
Midinguinal Point Location
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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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