Podcast
Questions and Answers
Damage to what artery is most likely if a peptic ulcer erodes the posterior wall of the superior part of the duodenum?
Damage to what artery is most likely if a peptic ulcer erodes the posterior wall of the superior part of the duodenum?
- Common hepatic artery
- Superior mesenteric artery
- Right gastric artery
- Gastroduodenal artery (correct)
Which anatomical structure is NOT located anterior to the descending part of the duodenum?
Which anatomical structure is NOT located anterior to the descending part of the duodenum?
- Gallbladder
- Right kidney (correct)
- Right lobe of the liver
- Transverse colon
What is the clinical significance of the suspensory ligament of the duodenum (ligament of Treitz)?
What is the clinical significance of the suspensory ligament of the duodenum (ligament of Treitz)?
- A landmark for identifying the duodenojejunal flexure (correct)
- Preventing kinking or twisting of the jejunum
- Controlling the rate of gastric emptying into the duodenum
- Regulating blood flow to the small intestine
The horizontal part of the duodenum passes anterior to which of the following structures?
The horizontal part of the duodenum passes anterior to which of the following structures?
What is a common site for diverticula to occur in the small intestine?
What is a common site for diverticula to occur in the small intestine?
What is the Kocher manoeuvre used to primarily expose?
What is the Kocher manoeuvre used to primarily expose?
What determines the location of the duodenojejunal junction?
What determines the location of the duodenojejunal junction?
What anatomical feature primarily characterizes the internal appearance of the descending part of the duodenum?
What anatomical feature primarily characterizes the internal appearance of the descending part of the duodenum?
What supplies arterial blood to the ascending part of the duodenum?
What supplies arterial blood to the ascending part of the duodenum?
What is the primary lymphatic drainage pathway from duodenum?
What is the primary lymphatic drainage pathway from duodenum?
Which of the following accurately describes the venous drainage of the duodenum?
Which of the following accurately describes the venous drainage of the duodenum?
What alteration is seen in the small intestine following surgical resection and adaptation?
What alteration is seen in the small intestine following surgical resection and adaptation?
What are the features that are most suggestive of the diagnosis congenital ileal diverticulum?
What are the features that are most suggestive of the diagnosis congenital ileal diverticulum?
How does the sympathetic nervous system affect the duodenum?
How does the sympathetic nervous system affect the duodenum?
In which anatomical structures does the anterior superior pancreaticoduodenal artery travel?
In which anatomical structures does the anterior superior pancreaticoduodenal artery travel?
There is a higher output with greater electrolyte loss in case of a proximal small intestine surgical intervention compared to distal small intestine, why is that the case?
There is a higher output with greater electrolyte loss in case of a proximal small intestine surgical intervention compared to distal small intestine, why is that the case?
How does the arterial arrangement for the small intestine impact outcomes from dilation or other vascular incidents?
How does the arterial arrangement for the small intestine impact outcomes from dilation or other vascular incidents?
There is smooth muscle throughout each villus; what is the implication of this anatomy?
There is smooth muscle throughout each villus; what is the implication of this anatomy?
What is the role of the M cells?
What is the role of the M cells?
Stem cells in the intestinal glands are exposed to specific molecules; what happens if the intestinal glands are injured or destroyed?
Stem cells in the intestinal glands are exposed to specific molecules; what happens if the intestinal glands are injured or destroyed?
Following the division of the peritoneum, you retract to the right what anatomical structure can you visualize?
Following the division of the peritoneum, you retract to the right what anatomical structure can you visualize?
What type of abdominal operation can benefit from reinnervation of the vessel for full function?
What type of abdominal operation can benefit from reinnervation of the vessel for full function?
An individual is found to have 258 intestinal folicles in their lymphoid patches. You can recognize that that individual is likely
An individual is found to have 258 intestinal folicles in their lymphoid patches. You can recognize that that individual is likely
Which cellular structure connects ICCs with each other and nearby smooth cells for better electrical conduction signals?
Which cellular structure connects ICCs with each other and nearby smooth cells for better electrical conduction signals?
What cellular structure has the highest number in individuals in the terminal ileum?
What cellular structure has the highest number in individuals in the terminal ileum?
Where are the Brunner glands?
Where are the Brunner glands?
Of the following choices, what is unique with patients that retain a section of continuity containing the ileum, in comparison to patients that retain a segment limited to only a duodenojejunal. Why?
Of the following choices, what is unique with patients that retain a section of continuity containing the ileum, in comparison to patients that retain a segment limited to only a duodenojejunal. Why?
The internal anal sphincter has a different make-up, what is that?
The internal anal sphincter has a different make-up, what is that?
What is one symptom experienced from an intestinal obstruction?
What is one symptom experienced from an intestinal obstruction?
Duodenal bulb is a result of what?
Duodenal bulb is a result of what?
How often does a typical Intestinal Epithelium get reproduced?
How often does a typical Intestinal Epithelium get reproduced?
Pancreaticduodenectomy operation are exposed by
Pancreaticduodenectomy operation are exposed by
Where do vessels enter when reaching the intestinal wall? (select nearest to where they enter)
Where do vessels enter when reaching the intestinal wall? (select nearest to where they enter)
What type of disease is less commonly found in individuals with malrotation because of their potential?
What type of disease is less commonly found in individuals with malrotation because of their potential?
What is the approximate length of the adult duodenum?
What is the approximate length of the adult duodenum?
Which anatomical structure is covered by peritoneum only on its proximal anterior surface?
Which anatomical structure is covered by peritoneum only on its proximal anterior surface?
What structural characteristic differentiates the duodenal bulb from the rest of the duodenum's internal appearance?
What structural characteristic differentiates the duodenal bulb from the rest of the duodenum's internal appearance?
Based on anatomical location, which part of the duodenum is at greatest risk of iatrogenic injury during surgical mobilization of the ascending colon and right colic flexure?
Based on anatomical location, which part of the duodenum is at greatest risk of iatrogenic injury during surgical mobilization of the ascending colon and right colic flexure?
What anatomical relationship is present between the horizontal part of the duodenum and the superior mesenteric artery?
What anatomical relationship is present between the horizontal part of the duodenum and the superior mesenteric artery?
Which statement accurately describes the suspensory ligament of the duodenum?
Which statement accurately describes the suspensory ligament of the duodenum?
What anatomical anomaly is implicated when the angle between the superior mesenteric artery and the abdominal aorta narrows enough to cause duodenal obstruction?
What anatomical anomaly is implicated when the angle between the superior mesenteric artery and the abdominal aorta narrows enough to cause duodenal obstruction?
A surgeon performing a Kocher maneuver to expose the posterior aspect of the pancreatic head would most likely need to divide which of the following?
A surgeon performing a Kocher maneuver to expose the posterior aspect of the pancreatic head would most likely need to divide which of the following?
If a patient has their jejunum surgically brought to the surface of the abdomen, what is one distinctive characteristic that can result from this type of stoma?
If a patient has their jejunum surgically brought to the surface of the abdomen, what is one distinctive characteristic that can result from this type of stoma?
What action would be most suitable following the Roux-en-Y procedure if they are continuing to suffer from duodenal reflux into the stomach?
What action would be most suitable following the Roux-en-Y procedure if they are continuing to suffer from duodenal reflux into the stomach?
During a surgical exploration, an omphalomesenteric artery is discovered still present; what additional finding is most commonly expected?
During a surgical exploration, an omphalomesenteric artery is discovered still present; what additional finding is most commonly expected?
What is the approximate duodenal length requirement for qualifying to have Short Bowel Syndrome?
What is the approximate duodenal length requirement for qualifying to have Short Bowel Syndrome?
In a patient following surgical bowel resection, which intestinal configuration is most likely to result in a greater chance of regaining intestinal autonomy?
In a patient following surgical bowel resection, which intestinal configuration is most likely to result in a greater chance of regaining intestinal autonomy?
What histological changes are observed in the remaining small intestine as a result of the intestinal adaptation process after surgical resection?
What histological changes are observed in the remaining small intestine as a result of the intestinal adaptation process after surgical resection?
Which anatomical structure descends posterior to the superior mesenteric vein?
Which anatomical structure descends posterior to the superior mesenteric vein?
Which of following findings are correlated with the diagnosis if Intestinal Failure?
Which of following findings are correlated with the diagnosis if Intestinal Failure?
In the context of arterial supply to the duodenum, what is the implication if there exists a common trunk from which the coeliac and superior mesenteric arteries arise?
In the context of arterial supply to the duodenum, what is the implication if there exists a common trunk from which the coeliac and superior mesenteric arteries arise?
What is the clinical significance of the fact that the human duodenum curves in both the anteroposterior direction and as a 'C' shape?
What is the clinical significance of the fact that the human duodenum curves in both the anteroposterior direction and as a 'C' shape?
During a small bowel resection, what is the significance of the diameter size in the jejunum?
During a small bowel resection, what is the significance of the diameter size in the jejunum?
What is a unique finding to be aware of while operating involving the blood supply and the small intestine?
What is a unique finding to be aware of while operating involving the blood supply and the small intestine?
What anatomical feature is found in the inner intestinal wall that enables better structural support in the ileum compared to the jejunum?
What anatomical feature is found in the inner intestinal wall that enables better structural support in the ileum compared to the jejunum?
How does the small intestine deal with the digestion of dietary fats across their membrane?
How does the small intestine deal with the digestion of dietary fats across their membrane?
What property is not a characteric in the function of the small intestine?
What property is not a characteric in the function of the small intestine?
What property is responsible for increasing the absorptive properties in the intestinal wall?
What property is responsible for increasing the absorptive properties in the intestinal wall?
In terms of absorption, what is the implication if some has a proximal small intestine versus distal small intestine issue?
In terms of absorption, what is the implication if some has a proximal small intestine versus distal small intestine issue?
A patient cannot generate salt across in what situation?
A patient cannot generate salt across in what situation?
What mechanism accounts for small intestinal motility in the period between meals?
What mechanism accounts for small intestinal motility in the period between meals?
What physiological change occurs in slow waves along the intestine?
What physiological change occurs in slow waves along the intestine?
A patient received an intestine transplant; what mechanism is important and required for that transplant to function?
A patient received an intestine transplant; what mechanism is important and required for that transplant to function?
What causes changes in MMC after sleep?
What causes changes in MMC after sleep?
During a colon operation, you cut into the area and see a yellow color around; what should happen/what is that?
During a colon operation, you cut into the area and see a yellow color around; what should happen/what is that?
If a patient is unable to secrete bile acid, what step will not happen?
If a patient is unable to secrete bile acid, what step will not happen?
In the small intestine, where does MALT reside?
In the small intestine, where does MALT reside?
Which cells perform the most actions found in the small intestine?
Which cells perform the most actions found in the small intestine?
Which protective measure do you keep in mind while working with the microvilli because of the actions for protection?
Which protective measure do you keep in mind while working with the microvilli because of the actions for protection?
Following a MALT response and action, what takes place for defense?
Following a MALT response and action, what takes place for defense?
What do Paneth cells help with when performing their purpose functionally?
What do Paneth cells help with when performing their purpose functionally?
If a patient is experiencing functional intestinal dysmotility due to a defect with the ICC, and can no longer generate the proper pacemaker, what needs to be looked into? ( select the best choice)
If a patient is experiencing functional intestinal dysmotility due to a defect with the ICC, and can no longer generate the proper pacemaker, what needs to be looked into? ( select the best choice)
What is the approximate percentage of the circumference of the muscular wall of the ileum that the small intestine mesentery abuts?
What is the approximate percentage of the circumference of the muscular wall of the ileum that the small intestine mesentery abuts?
Which portion of the duodenum lacks a peritoneal covering on its anterior surface?
Which portion of the duodenum lacks a peritoneal covering on its anterior surface?
What anatomical feature runs posterior to the horizontal part of the duodenum?
What anatomical feature runs posterior to the horizontal part of the duodenum?
What is the functional implication of the duodenum curving in both anteroposterior direction and also as a C shape?
What is the functional implication of the duodenum curving in both anteroposterior direction and also as a C shape?
What is the result of losing the perivascular adipose tissue located in the angle between the superior mesenteric artery and the abdominal aorta?
What is the result of losing the perivascular adipose tissue located in the angle between the superior mesenteric artery and the abdominal aorta?
In a surgical operation, what does the Kocher manoeuvre involve?
In a surgical operation, what does the Kocher manoeuvre involve?
If the suspensory ligament of the duodenum is short and narrow, what is the expected trajectory of the ascending part of the duodenum?
If the suspensory ligament of the duodenum is short and narrow, what is the expected trajectory of the ascending part of the duodenum?
Which of the following accurately describes the anatomical relationship of the gastroduodenal artery as it relates to the duodenum?
Which of the following accurately describes the anatomical relationship of the gastroduodenal artery as it relates to the duodenum?
Which artery is at risk of erosion due to a penetrating peptic ulcer on the posterior wall of the duodenum?
Which artery is at risk of erosion due to a penetrating peptic ulcer on the posterior wall of the duodenum?
Why is ischaemia of the duodenum a rare clinical finding?
Why is ischaemia of the duodenum a rare clinical finding?
Which statement accurately describes the arrangement of the superior pancreaticoduodenal arteries?
Which statement accurately describes the arrangement of the superior pancreaticoduodenal arteries?
What is the implication of there not being many connections between the terminal arterial branches close to the intestinal wall?
What is the implication of there not being many connections between the terminal arterial branches close to the intestinal wall?
What are the steps of performing left medial visceral rotation?
What are the steps of performing left medial visceral rotation?
During a transverse colon reflection approach, where might a surgeon expose the superior mesenteric artery?
During a transverse colon reflection approach, where might a surgeon expose the superior mesenteric artery?
What does the remnant of the omphalomesenteric artery give rise to?
What does the remnant of the omphalomesenteric artery give rise to?
If the ileum exhibits multiple tiers of vascular arcades, what is the functional implication?
If the ileum exhibits multiple tiers of vascular arcades, what is the functional implication?
What is the role of myoepithelial cells?
What is the role of myoepithelial cells?
Where are the aggregated lymphoid nodules most heavily concentrated?
Where are the aggregated lymphoid nodules most heavily concentrated?
What occurs if there is damage to the Paneth cells?
What occurs if there is damage to the Paneth cells?
What is the result of damage to the stem cells?
What is the result of damage to the stem cells?
Which of the following is a key feature of ileal diverticulum?
Which of the following is a key feature of ileal diverticulum?
In the small intestine, where do the majority of the immune cells reside?
In the small intestine, where do the majority of the immune cells reside?
Patients with ileal diverticulum pain are referred to the periumbilical region because
Patients with ileal diverticulum pain are referred to the periumbilical region because
In the epithelium what is the mechanism for defense for cells to increase secretion against injury and what is its role?
In the epithelium what is the mechanism for defense for cells to increase secretion against injury and what is its role?
Following small intestine anastomosis; what is unique with patients that retain a segment limited to only a duodenojejunal vs those that retain a portion with the ileum? What outcomes is more likely?
Following small intestine anastomosis; what is unique with patients that retain a segment limited to only a duodenojejunal vs those that retain a portion with the ileum? What outcomes is more likely?
What factor is responsible for helping the jejunum provide a wide surface area?
What factor is responsible for helping the jejunum provide a wide surface area?
What occurs in between meals in the small intestine?
What occurs in between meals in the small intestine?
After absorption, how do dietary fats get through the small intestine?
After absorption, how do dietary fats get through the small intestine?
The small intestine spans from the stomach's pylorus to the ileocaecal junction, averaging a length of 5 meters in adults.
The small intestine spans from the stomach's pylorus to the ileocaecal junction, averaging a length of 5 meters in adults.
The duodenum extends from the stomach to the ileocaecal valve, marked by the ligament of Treitz.
The duodenum extends from the stomach to the ileocaecal valve, marked by the ligament of Treitz.
The jejunum and ileum are fixed in the proximal abdomen, separate from the colon loops.
The jejunum and ileum are fixed in the proximal abdomen, separate from the colon loops.
In an erect position, jejunum loops can descend anterior to the rectum.
In an erect position, jejunum loops can descend anterior to the rectum.
The small intestine mesentery abuts about 50% of the muscular wall of the ileum.
The small intestine mesentery abuts about 50% of the muscular wall of the ileum.
The adult duodenum measures approximately 45 cm.
The adult duodenum measures approximately 45 cm.
The duodenum is 'draped' over the prominence formed by the thoracic spine.
The duodenum is 'draped' over the prominence formed by the thoracic spine.
Only the distal 2.5 cm of the superior part of the duodenum is covered by peritoneum.
Only the distal 2.5 cm of the superior part of the duodenum is covered by peritoneum.
The lesser omentum is attached to its inferior border and the greater omentum to its superior border.
The lesser omentum is attached to its inferior border and the greater omentum to its superior border.
The internal appearance of the duodenal bulb readily constricts on insufflation during endoscopy.
The internal appearance of the duodenal bulb readily constricts on insufflation during endoscopy.
The superior part of the duodenum transitions solely at the superior duodenal flexure.
The superior part of the duodenum transitions solely at the superior duodenal flexure.
The gastroduodenal artery lies immediately anterior to the posterior wall of the duodenum.
The gastroduodenal artery lies immediately anterior to the posterior wall of the duodenum.
The descending part of the duodenum extends to the inferior border of the second lumbar vertebral.
The descending part of the duodenum extends to the inferior border of the second lumbar vertebral.
Part of the head of the pancreas is frequently embedded in the lateral duodenal wall.
Part of the head of the pancreas is frequently embedded in the lateral duodenal wall.
The bile and pancreatic duct enters the lateral wall.
The bile and pancreatic duct enters the lateral wall.
The horizontal part ends at the inferior denal flexure and is approximately 10cm long.
The horizontal part ends at the inferior denal flexure and is approximately 10cm long.
The horizontal part is located anterior to the inferior vena cava and abdominal aorta.
The horizontal part is located anterior to the inferior vena cava and abdominal aorta.
The ascending part runs superiorly and laterally to the level of the superior border of the fifth lumbar vertebra.
The ascending part runs superiorly and laterally to the level of the superior border of the fifth lumbar vertebra.
The inferior mesenteric vein lies either posterior to the duodenojejunal flexure or at its inferior margin.
The inferior mesenteric vein lies either posterior to the duodenojejunal flexure or at its inferior margin.
The duodenum is the least common site for a diverticulum in the small intestine.
The duodenum is the least common site for a diverticulum in the small intestine.
Match the anatomical description with the corresponding part of the duodenum:
Match the anatomical description with the corresponding part of the duodenum:
Match the digestive function with the corresponding intestinal structure:
Match the digestive function with the corresponding intestinal structure:
Match the anatomical relation with the corresponding part of the duodenum:
Match the anatomical relation with the corresponding part of the duodenum:
Match the vessel with its tributary:
Match the vessel with its tributary:
Match the vessel with its branch:
Match the vessel with its branch:
Match the cell type with its function in the intestinal wall:
Match the cell type with its function in the intestinal wall:
Match the pathology with its common location:
Match the pathology with its common location:
Match the structural feature with its digestive function:
Match the structural feature with its digestive function:
Match the surgical procedure and the relevant anatomical structure:
Match the surgical procedure and the relevant anatomical structure:
Match the clinical condition with its description:
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Flashcards
Length of the Small Intestine
Length of the Small Intestine
The small intestine extends from the pylorus to the ileocaecal junction and is approximately 5 meters long.
Jejunum-Ileum Boundary
Jejunum-Ileum Boundary
There is no clear boundary between the jejunum and ileum, but a gradual transition in morphology from the proximal to distal ends of the intestine.
Small Intestine Position
Small Intestine Position
The duodenum is mostly retroperitoneal, while the jejunum and ileum occupy the central and distal parts of the abdominal cavity.
Shape of Duodenum
Shape of Duodenum
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Pancreas-Duodenum Position
Pancreas-Duodenum Position
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Superior Duodenum
Superior Duodenum
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Duodenum Circular Folds
Duodenum Circular Folds
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Superior Duodenum Relations
Superior Duodenum Relations
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Duodenal Ulcer Risk
Duodenal Ulcer Risk
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Descending Duodenum
Descending Duodenum
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Bile & Pancreatic Ducts
Bile & Pancreatic Ducts
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Duodenum Posterior Relations
Duodenum Posterior Relations
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Horizontal Duodenum
Horizontal Duodenum
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Duodenum Relations(Horizontal)
Duodenum Relations(Horizontal)
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Ligament of Treitz
Ligament of Treitz
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Duodenum Diverticula
Duodenum Diverticula
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What is the Kocher Manoeuvre
What is the Kocher Manoeuvre
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Duodenum Blood Supply
Duodenum Blood Supply
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Gastroduodenal Artery
Gastroduodenal Artery
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SMA Origin
SMA Origin
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Sympathetic Innervation
Sympathetic Innervation
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Jejunum Features
Jejunum Features
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Jejunum vs. Ileum
Jejunum vs. Ileum
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Lymphoid Nodules Distal
Lymphoid Nodules Distal
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Meckel's Diverticulum
Meckel's Diverticulum
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Jejunum mesentery vs illeium
Jejunum mesentery vs illeium
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What's an ostomy?
What's an ostomy?
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Short Bowel Syndrome
Short Bowel Syndrome
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Intestinal Transit is
Intestinal Transit is
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Where b12 is at?
Where b12 is at?
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Where do lacteas run?
Where do lacteas run?
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Terminal Ileum
Terminal Ileum
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Superior Duodenal Flexure
Superior Duodenal Flexure
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Duodenal Bulb Radiographs
Duodenal Bulb Radiographs
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Major Duodenal Papilla
Major Duodenal Papilla
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Hood of the Major Papilla
Hood of the Major Papilla
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Inferior Mesenteric Vein Location
Inferior Mesenteric Vein Location
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Suspensory Ligament Length
Suspensory Ligament Length
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Gastroduodenal Artery Divides
Gastroduodenal Artery Divides
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Posterior Superior Pancreaticoduodenal Artery
Posterior Superior Pancreaticoduodenal Artery
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Anterior Pancreaticoduodenal Artery
Anterior Pancreaticoduodenal Artery
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Pancreaticoduodenal Vein(Superior)
Pancreaticoduodenal Vein(Superior)
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Duodenum Venous Anastomoses
Duodenum Venous Anastomoses
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small instestine transplant revovery
small instestine transplant revovery
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Duodenal Bulb Appearance
Duodenal Bulb Appearance
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Posterior Superior Pancreaticoduodenal Artery
Posterior Superior Pancreaticoduodenal Artery
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Meckel's Diverticulum Connection
Meckel's Diverticulum Connection
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illeum
illeum
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Small Intestine
Small Intestine
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Hepatopancreatic Ampulla
Hepatopancreatic Ampulla
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Jejunum
Jejunum
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Jejunal Artery Branches
Jejunal Artery Branches
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Duodenal Veins
Duodenal Veins
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Duodenum Lymphatics
Duodenum Lymphatics
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Kocher Maneuver Purpose
Kocher Maneuver Purpose
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Duodenum Role of Plicae Circulares
Duodenum Role of Plicae Circulares
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The anterior pancreaticoduodenal artery connects to
The anterior pancreaticoduodenal artery connects to
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Jejunal branches supplies
Jejunal branches supplies
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Where apenndix and diverticulum form
Where apenndix and diverticulum form
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Duodenum Mucosa
Duodenum Mucosa
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Duodenum Submucosa
Duodenum Submucosa
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Duodenum Serosa
Duodenum Serosa
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Duodenum Muscularis Externa
Duodenum Muscularis Externa
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Intestinal Lacteal
Intestinal Lacteal
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Peyer's Patches
Peyer's Patches
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Ileum role in bile acid reabsorption
Ileum role in bile acid reabsorption
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What do stem cells do?
What do stem cells do?
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Neuroendocrine Cells in Gut
Neuroendocrine Cells in Gut
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Where are MALT's?
Where are MALT's?
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What does muscularis affect
What does muscularis affect
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what are in cajal
what are in cajal
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Serosa surronds what
Serosa surronds what
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Approaches transverse?
Approaches transverse?
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Small intestine transplant
Small intestine transplant
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Superior (first) part Duodenum
Superior (first) part Duodenum
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Duodenojejunal Flexure
Duodenojejunal Flexure
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The Duodenum
The Duodenum
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Loss of perivascular adipose, tissue
Loss of perivascular adipose, tissue
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Jejunal Feeding Purposes.
Jejunal Feeding Purposes.
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The Kocher Maneuver
The Kocher Maneuver
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SMA
SMA
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ICC
ICC
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Study Notes
Okay, I've updated the study notes with the new information.
- The small intestine is 5 metres (3–8.5 metres) long when measured intraoperatively in adults.
- The jejunum and ileum occupy the central and distal parts of the abdominal cavity within the colon boundary.
- The small intestine attaches to the anterior retroperitoneum via a mesentery, allowing intestinal loops to be relatively mobile.
- Loops of jejunum can be anterior to the transverse colon, stomach, and lesser omentum in the supine position.
- Loops of ileum can descend into the pelvis anterior to the rectum in the erect position.
- The greater omentum covers the proximal jejunum and ileum to a variable extent.
- The visceral peritoneum covers the jejunum and ileum except at mesenteric borders.
- Small intestine mesentery abuts 20% of the muscular wall circumference of the ileum, and less of the jejunum.
Superior Part
- The superior part of the duodenum has a mean length of 5cm.
- The duodenum is C shaped between the L1 and L3 vertebrae in the supine position, at the level of the umbilicus.
- The superior part lies anterior to the gastroduodenal artery, bile duct and hepatic portal vein and anterosuperior to the head and neck of the pancreas.
- A penetrating peptic ulcer in the posterior wall can erode into the gastroduodenal artery or its branches, causing dramatic haemorrhage.
- A penetrating peptic ulcer in the anterior wall of the superior part can perforate into the peritoneal cavity, causing peritonitis.
- Becuase of the anterior surface of the superior part of the duodenum is only covered by peritoneum, this can cause peritonitis
- Lymph nodes near the common hepatic and hepatoduodenal arteries lie close to the superior part and can be visualized with endoscopic ultrasound.
Descending Part
- The descending part of the duodenum is approximately 8 cm long, peritoneum covers only its proximal anterior surface.
- The descending part of the duodenum is covered by peritoneum alone on its proximal anterior surface.
- The descending part lies anterior to the hilum of the right kidney, the right renal vessels, and the lateral edge of the inferior vena cava and right psoas major.
- Transverse colon crosses the start of the descending part of the duodenum anteriorly.
- The right end of the gastrocolic ligament and the origin of the transverse mesocolon attach to the duodenum's anterior surface by loose connective tissue.
- The head of the pancreas and the bile duct are medial, and the right colic flexure is cephalad and lateral.
- Surgical mobilization of the ascending colon and right colic flexure poses a risk of iatrogenic injury to the descending part of the duodenum
- The bile and pancreatic ducts enter the medial wall, forming a common channel which contains the hepatopancreatic ampulla (of Vater).
- A duodenal mucosal fold sometimes encircles the major papilla, forming a hood, as per Horiguchi and Kamisawa 2010.
- The accessory pancreatic duct (of Santorini) may be present, opening 2 cm proximal to the major papilla on the minor duodenal papilla, per Kamisawa et al 2010, Suda 2010.
Horizontal Part
- the Horizontal part of the duodenum is 10cm long
- the Horizontal part if the duodenum passes to the left slightly superiorly, towards the inferior vena cava and abdominal aorta.
- Loss of perivascular adipose tissue can cause a rare obstruction, referred to as superior mesenteric artery syndrome, as per Merrett et al, 2009.
- The peritoneum covers the anterior surface of the left end and horizontal part of the duodenum
Duodenal Diverticula
- Fotiades et al, 2005, details possible complications of the duodenal diverticula.
- The Duodenum is the most common site for diverticulum in the small intestine.
- The diverticula are typically located on the medial wall of the descending part of the duodenum, intimately related to the head of the pancreas.
Ascending Part
- The ascending (fourth) part of the duodenum is 2.5 cm long.
- At the lateral limite ascending part gradually invest in the peritonium, resulting in the duodenojejunal flexure that suspends from the anterior wall
- The suspensory ligament has two parts; the first has skeletal muscle fibers from the right crus of the diaphragm to connective tissue around the coeliac trunk.
- The second part has smooth muscle descending from connective tissue around the coeliac trunk to the duodenum.
Innervation
- Bertelli, 1997, provides more information on the description of how to innervate.
Jejunum
- Typical cross-sections through the proximal jejunum and terminal ileum feature a wider mesenteric attachment in the jejunum, with vascular leaves within the intestinal wall being thicker in the jejunum.
Ileum
- The ileum primarily lies in the hypogastric region and right inguinal region.
Anatomical differences between the Jejunum and the Ileum
- Conley et al 2010 provides a refence for the anatomical differences.
- The straight arteries in the ileum are more numerous, shorter, and narrower than in the jejunum, per Rosenblum et al, 1997.
- Cornes in 1965 details various observations about aggregated lymphoid nodule size.
Jejunum Surgical Implications
- If the intestine is open on the surface, volume in the jejunostomy is more than in the ileostomy and may result in loss of more nutrients.
- The full length of the small intestine from the duodenojejunal flexure to the ileocaecal junction is roughly 5 meters in a male body, but can range.
- Teitelbaum talks about the small intestine lengths.
Ileum Surgical Implications
- Meckel's diverticulum is a rare congenital ileal diverticulum that contains ectopic mucosa.
Functionality of the small intestine
- O'Keefe et al, 2006 states that short bowel syndrome results from surgical resection that results in loss of absorption.
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