TMA SM Flashcards
where does the midgut span from
major duodenal papilla (of the duodenum) to the proximal 2/3 of the transverse colon.
parth of the SM and what are its important anatomical relations?
2nd branch of coeliac. It arises anteriorly from the abdominal aorta at the level of the L1 vertebrae, immediately inferior to the origin of the coeliac trunk.
After arising from the abdominal aorta, the superior mesenteric artery descends down the posterior aspect of the abdomen. At this point, it has several important anatomical relations:
Anterior to the SMA – pyloric part of the stomach, splenic vein and neck of the pancreas.
Posterior to the SMA – left renal vein, uncinate process of the pancreas and inferior part of the duodenum.
The uncinate process is the only part of the pancreas that hooks around the back of the SMA
what are the major branches of the Superior Mesenteric arteries
Jejunal Ilial Right side Middle colic Right Colic Last Iliocolic
path of the ileocolic artery
It passes inferiorly and to the right, giving rise to branches to the ascending colon, appendix, cecum,
What do the right and middle colic supple
asending and transverse colic arteries
path of the jejunal and ileal arteries
Fig 1.3 - Arterial supply to the jejunum and ileum of the small intestine Fig 2 – The characteristic features of the jejunal and ileal blood supply.
The superior mesenteric artery gives rise to numerous arteries that supply the jejunum and ileum.
The arteries pass between the layers of the mesentery and form anastomotic arcades – from which smaller, straight arteries (known as the “vasa recta”) arise to supply the organs
charateristic features of jejunal and ileal blood supply
The jejunal blood supply is characterised by a smaller number of arterial arcades, but longer vasa recta. In contrast, the ileal blood supply is marked by more arterial arcades with shorter vasa recta.
supeiror mesenteric arises from
L1
