This begins at formation of the mesosigmoid (sigmoid mesocolon). At its junction with the descending colon, the sigmoid colon becomes completely intraperitonealized using the sigmoid mesocolon. It is about 40 cm long. It lies to the left of the abdominopelvic corridor and forms the lower boundary of the left infracolic compartment. It ends at the anterior aspect of the third piece of sacrum where it becomes the rectum.

 

DIGITAL LOCATOR OF SIGMOID COLON FROM ABOVE (ABDOMEN)): Layer 1, skin of abdomen above the pelvic cavity; Layer 2 of fasciae of anterior abdominal wall; Layer 3 of rectus sheath; Layer 4 of parietal peritoneum and transversalis fascia; Layer 5 of peritoneal pelvic cavity; Layer 6 of pelvic peritoneum and fascia; Layer 7 of greater pelvis; Roll over mouse to label; click to display pages and click blinking endpage to display sigmoid colon

Arteries:

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Sigmoidal arteries which are branches of the inferior mesenteric artery.

Veins:

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Sigmoidal veins, which are tributaries of the inferior mesenteric vein. The inferior mesenteric vein enters the splenic vein, which helps to form the portal vein.

Nerves:

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Parasympathetic fibers are through the pelvic splanchnic nerves (or nervi erigentes) from S2-4.

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Sympathetic fibers are from the lumbar splanchnic nerves, which relay in the inferior mesenteric ganglion of the inferior mesenteric plexus and are from the superior hypogastric plexus

The sigmoid colon lies free in the pelvic cavity and is covered anteriorly by the anterior abdominal wall and the anterior wall of lesser pelvis. It is placed inferior to the coils of intestine and lies on the posterior parietal peritoneum.



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Gut (intestines)- 3D

 
Sigmoid colon in Layer 7of greater pelvis

 

 

 

 

 

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