important GI Flashcards
what is the blood supply to the foregut?
coeliac trunk
what nerves innervate the foregut?
greater splanchnic nerve T5-9
what is the blood supply to the midgut?
Superior mesenteric artery
what nerves innervate the midgut
lesser splanchnic nerve T10-11
what is the blood supply to the hindgut
Inferior mesenteric artery
what nerves innervate the hindgut
least splanchnic nerve T12
what are rugae
muscular ridges on the stomachs inner surface
what are the 2 openings to the stomach
cardiac and pyloric
what are the 5 parts of the stomach called
cardia, fundus, body, antrum, pylorus
what are the 2 sphincters in the stomach?
cardiac sphincter
pyloric sphincter
what gives the stomach its blood supply?
branches of the coeliac trunk
blood supply to the greater curvature of the stomach
R & L gastroepiploic artery
(R arises from common hepatic artery via the gastroduodenal artery
L is a branch of the splenic artery)
blood supply to the lesser curvature of the stomach
R & L gastric arteries
(L is direct from coeliac trunk
R arises from the common hepatic artery)
where does the fundus of the stomach get it’s blood supply from?
short gastric arteries (branches of the splenic artery)
where do the common bile duct and main pancreatic duct empty into the duodenum
the second part of the duodenum via the major papilla and the flow is controlled by the sphincter of Oddi
what are the 4 parts of the duodenum
superior, descending, inferior, ascending
mucosa of D1 is smooth, whereas the rest has plicae circulares
what proportions do the jejunum and ileum comprise of
2/5 jejunum
3/5 ileum
which is wider the jejunum or ileum?
jejunum
describe the walls of the jejunum vs ileum
jejunum = thick + double ileum = thin
what is the blood supply of the jejunum
long arteries & few vasa rectae
what is the blood supply of the ileum
short arteries & many vasa rectae
describe the arterial blood supply of the large intestine
Ascending = right colic artery from superior mesenteric artery
Transverse = middle colic artery from superior mesenteric artery
Descending – left colic artery from inferior mesenteric artery
Sigmoid = sigmoidal arteries from inferior mesenteric artery
describe the venous drainage of the large intestine
Ascending = superior mesenteric vein Transverse = superior mesenteric vein Descending = inferior mesenteric Sigmoid = inferior mesenteric vein
what is the difference between the longitudinal muscle layer in the small and large intestine
small: continuous
large: not continuous - 3 muscles called tenae coli