Blood Supply and Drainage of the Large Bowel PDF

### **Blood Supply:** - The midgut is supplied by the superior mesenteric artery. - The hindgut is supplied by the inferior mesenteric artery. - In rectum, there are anastomoses between branches of inferior mesenteric and pudendal vessels, and an anastomosis also occurs between superior and inferio...

### **Blood Supply:** - The midgut is supplied by the superior mesenteric artery. - The hindgut is supplied by the inferior mesenteric artery. - In rectum, there are anastomoses between branches of inferior mesenteric and pudendal vessels, and an anastomosis also occurs between superior and inferior mesenteric vessels via marginal artery. ### **Venous Drainage:** - All blood drains into the portal venous system via the superior mesenteric vein and the inferior mesenteric vein (corresponding to arterial supply). - The inferior mesenteric vein joins the splenic vein, which merges with the superior mesenteric vein to form portal vein. ### **Lymphatic Drainage:** - The right side of the large bowel drains into the inferior mesenteric nodes and from there to the superior mesenteric nodes and para-aortic nodes. - The left side of the large bowel drains directly into the superior mesenteric nodes. ### **Innervation:** - Parasympathetic supply to the large bowel is partly via the vagus nerve, but the distal part of large bowel receives parasympathetic fibres from sacral segments via pelvic splanchnic nerves. - Sympathetic nervous supply to the large bowel is from spinal cord segments T10-L2.