The
transverse colon is the longest and most movable part of the
colon. It crosses the
abdomen from the
ascending colon at the hepatic or
right colic flexure with a downward convexity to the
descending colon where it curves sharply on itself beneath the lower end of the
spleen forming the splenic or
left colic flexure. In its course, it describes an arch, the concavity of which is directed backward and a little upward. Toward its splenic end there is often an abrupt U-shaped curve which may descend lower than the main curve.