Small intestine Flashcards
Where do the small intestines begin?
After the pyloric sphincter
Where do the small intestines end?
Ileo-caecal junction
What are the parts of the small intestines?
Duodenum
Jejunum
Ileum
How does the duodenum relate to the peritoneum?
It is mostly retroperitoneal
What are the parts of the duodenum?
Superior
Descending
Inferior
Ascending
What structures are anterior to the superior part of the duodenum?
Liver
Gall bladder
What is attached to the superior part of the duodenum?
Hepatoduodenal ligament of lesser omentum
What structures is the descending part of the duodenum anterior to?
Anterior to the right kidney
What structures is the descending part of the duodenum posterior to?
Transverse colon
What structures is the descending part of the duodenum on the left to?
Head of pancreas
IVC
What feeds into the descending part of the duodenum?
Ampulla of vater
Where on the descending part of the duodenum does the ampulla of vater feed into it?
Major duodenal papilla
What structures is the ascending part of the duodenum adjacent to?
Aorta
What does the ascending part of the duodenum ascend up to?
Inferior border of body of pancreas
What structures is the inferior part of the duodenum anterior to?
IVC
Aorta
What structures is the inferior part of the duodenum inferior to?
Pancreas
What structures is the inferior part of the duodenum posterior to?
Superior mesenteric artery and vein
What is the name of the junction between the duodenum and the jejunum?
Duodenojejunal flexure
What shape is the duodenum?
C shape
Where does the jejunum begin?
Duodenojejunal flexure
Where does the jejunum end? Where does the ileum begin?
No clear demarcation between the jejunum and ileum
How do the jejunum and ileum relate to the peritoneum?
Both intraperitoneal
What else does the mesentery attaching to the jejunum and ileum attach to?
Posterior abdominal wall
How does the mesentery of the jejunum and ileum attach to the posterior abdominal wall?
In an obliquely inferior direction to the right
from the duodenojejunual flexure to the ileocaecal valve
Where are the blood vessels supplying the jejunum and ileum located?
In the mesentery of the jejunum and ileum
What is the arrangement of blood vessels supplying the jejunum and ileum?
Form loops, called arcades
Straight arteries branch off, called vasa recta
How do the walls of the jejunum and ileum compare to each other?
Jejunum has a thicker wall
Ileum has a thinner wall
How do the lumens of the jejunum and ileum compare to each other?
Jejunum has a wider lumen
Ileum has a narrower lumen
How do the blood supplies of the jejunum and ileum compare to each other?
Jejunum has fewer arcades, longer vasa recta
Ileum has more arcades, shorter vasa recta
How do the colours of the jejunum and ileum compare to each other?
Jejunum is more red
Ileum is more pink
How do the mesentery of the jejunum and ileum compare to each other?
Jejunum mesentery has less fat in it
Ileum mesentery has more fat in it
Where does the ileum end?
Ileo-caecal valve
How do the plicae circulares of the jejunum and ileum compare to each other?
Jejunum has more, thicker and taller plicae circulares
than ileum
