Colon

That part of the large intestine which extends from the ascending colon to the sigmoid colon. It therefore consist of the following parts

	Cecum
	Ascending colon
	Transverse colon
	Descending colon
	Sigmoid colon
	Hepatic flexure
	Splenic flexure

Arteries

It is supplied by the right colic artery (ascending colon), middle colic artery (transverse colon), left colic artery (descending colon), sigmoidal arteries (sigmoid colon). They are all branches of the inferior mesenteric artery.

Veins

It is drained by corresponding veins - right colic vein (ascending colon), middle colic vein (transverse colon). Left colic vein (descending colon), sigmoidal vein (sigmoid colon). They all drain into the inferior mesenteric vein.

	Parasympathetic fibers are through the vagi via the celiac plexus and the superior mesenteric plexus. They supply the colon up to the splenic flexure. The remaining is supplied by the pelvic parasympathetic outflow.
	Sympathetic fibers are from the lumbar and pelvic splanchnic nerves.

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Distal gut- 3D rotation

DIGITAL LOCATOR OF COLON: Layer 1 Skin of abdomen (anterior abdominal wall). Layer 2- Layer of Camper's fascia. Layer 3 - layer of Scarpa's fascia. Layer 4 - layer of external oblique muscle/aponeurosis. Layer 5- layer of rectus sheath. Layer 6- layer of internal oblique. Layer 7 - layer of transversus abdominis. Layer 8- layer of transversus abdominis/parietal peritoneum. Layer 9- layer of greater sac of peritoneum. Layer 10- layer of small intestine and colon.

Transverse colon


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