Small Intestine Flashcards
the foregut receives arterial supply from the ____
celiac trunk
the midgut receives arterial supply from the ____
superior mesenteric a
the hindgut receives arterial supply from the ____
inferior mesenteric a
the superior mesenteric artery arises from the abdominal aorta at the level of ____
L1
name the organs supplied by the superior mesenteric artery
(midgut)
- jejunum
- ileum
- cecum
- appendix
- ascending colon
- transverse colon
name the branches of the superior mesenteric artery
- inf pancreaticoduodenal a
- middle colic a
- right colic a
- ileocolic a
- appendicular a
- jejunal aa
- ileal aa
the middle colic artery goes to the ____
transverse colon
the right colic artery goes to the ____
ascending colon
the ileocolic artery goes to the ____
cecum
veins mirror arteries and drain into…
superior or inferior mesenteric vein
how many branches do the superior mesenteric vessels have for the jejunum and ileum?
15-18
jejunal and ileal arteries join to form loops called ____ that give rise to ____
arterial arcades
vasa recta
what vessels form the portal vein?
superior mesenteric v + splenic v
Superior mesenteric blood vessels are surrounded by ____
superior mesenteric plexus
superior mesenteric plexus
- SNS from T8-T10 (greater & lesser splanchnic nn)
- PSNS from vagus n
the small intestine is ____ m long, and is composed of more ____ than ____
6-7m
ileum > jejunum
what mesentery covers the small intestine?
principle mesentery
what attaches the small intestine to the posterior abdominal wall?
root of mesentery
where does the root of the mesentery attach on the small intestine?
duodenojejunal junction (left side L2)
to ileocolic junction (right side SI jt)
describe the differences in the pattern of arterial arcades in the jejunum and ileum
- jejunum: simple, not complex
- ileum: shorter, more complex/overlapping
describe the differences in the vasa recta of the jejunum and ileum
- jejunum: long, straight
- ileum: shorter, more numerous
describe the differences in plicae circulares (mucosal folds) of the jejunum and ileum
- jejunum: taller, more numerous
- ileum: shorter, less numerous (less absorption here)
describe the differences in encroaching fat of the jejunum and ileum
- jejunum: not present
- ileum: present
what are lacteals?
specialized lymphatic vessels in intestinal villi of the jejunum & ileum that absorb fat
