From Donna Myers, former About.com Guide
Updated: February 7, 2007
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
The serosa is the outmost layer of the colon
. If you think of your colon as a garden hose, the serosa is the part of the hose that touches your hand. The serosa is also called the adventitia and its main purpose is to make sure your colon stays put while you move around.