Anatomy of colon

The colon is about six feet long and is the part of the body's digestive system that moves waste material from the small intestine to the rectum. The small intestine sucks the nutrients out of what you eat and then pours the leftover sludge into the cecum. This sludgy waste then moves from the cecum to the colon for further processing.
Cecum (proximal right colon)--6 x 9 cm pouch covered with peritoneum Appendix--a vermiform

(wormlike) diverticulum located in the lower cecum Ascending colon--20-25 cm long, located behind the peritoneum Hepatic flexure--lies under right lobe of liver Transverse colon--lies
anterior in abdomen, attached to gastrocolic ligamentSplenic flexure--near tail of pancreas and spleenDescending colon--10-15 cm long, located behind the peritoneumSigmoid
colon-loop extending distally from border of left posterior major psoas muscleRectosigmoid segment--between 10 and 15 cm from anal verge Rectum--12 cm long, upper third covered by
peritoneum; no peritoneum on lower third which is also calledthe rectal ampulla.
About 10 cm of the rectum lies below the lower edge of the peritoneum (below the peritoneal reflection), outside the peritoneal cavity.Anal canal most distal 4-5 cm to anal verge.