Small Intestine Flashcards
(42 cards)
What is the longest part of the GI tract?
small intestine
What does the small intestine extend from?
pyloric orfice to ileocecal junction
How long is the small intestine?
7 m in length
What does the small intestine absorb?
nutrients and water
What does the large intestine absorb?
some water
Where does almost entirely all the absorption occur?
small intestine
What three parts make up the small intestine?
duodenum (shortest)
Jejunum (longest)
Ileum (distal part)
What is the duodenum?
C-shaped tube surrounds the head of the pancreas
What is the characteristics of duodenum in length and width?
25 cm long and widest part of small intestine
What are the four parts of the duodenum?
superior part
descending part
inferior part
ascending par
Where is the duodenal cap (ampulla)?
beginning of superior part
What is in the descending part?
junction for foregut and midgut where bile and pancreatic duct empty
What is the longest part of the duodenum?
inferior part
What are duodenal brunner glands?
secrete an alkaline mucus which gives dilute stomach acid
Suspensory muscle is what?
fibromuscular band which extends from diaphragm to duodenojejunal flexure
What is the only part of the duodenum that isnt retroperitoneal?
duodenal cap (distal end of 4th part might also be intraperitoneal)
Where does the mesenteric artery and vein pass?
anterior to third part of duodenum
What is the blood supply to the duodenum?
superior and inferior pancreaticoduodenal artery
supraduodenal artery
What does the inferior pancreaticoduodenal artery supply?
third and fourth part of duodenum
What is the innervation of the duodenum?
autonomic fibers from the celiac and superior mesenteric plexuses
What part does the jejunum make up of the small intestine?
proximal 2/5, distal to duodenum
Where does the jejunum begin?
duodenojejunal flexure
What part does the ileum make up of the small intestine?
distal 3/5
What segment of GI tract is most involved in nutrient absorption?
jejunum
