ZOO 3733C Lecture Notes - Lecture 4: Inferior Mesenteric Artery, Superior Mesenteric Artery, Celiac Artery
Document Summary
Foregut: includes esophagus, stomach, and down to the second part of duodenum. The liver, biliary system, gallbladder, and pancreas are derivatives of foregut: innervated by celiac trunk. Midgut: includes the lower half of the second part of duodenum, jejunum, ileum, and colon: innervated by superior mesenteric artery. Hindgut: include left/distal one third of the transverse colon, the descending colon, sigmoid colon, rectum, and upper part of anal canal: innervated by inferior mesenteric artery. Innervations: up to 2/3 right of the transverse colon: sympathetic vagus n, from 1/3 left of transverse colon down to anal canal: pelvic splanchnic n. (s2-s4, from lower esophagus to anus: t5-l2 spinal segments. Adventitia: protective layer that acts as an anchoring point. Blood supply of esophagus: upper portion (cervical): inferior thyroid a, middle portion (thoracic): thoracic aorta (4-5 aa. ) and bronchial aa, lower portion( inc. abdominal): l gastric a. (from celiac a. ) and inferior phrenic a. (from abdominal aorta)
