Ascending front only
Descending front only
Colorectal Cancer: Serosal Layer
Rectum no serosa
As discussed in the anatomy presentation, not all segments of the colon and rectum are covered by serosa or visceral peritoneum. Sites covered by serosa include the cecum, transverse colon, sigmoid colon, the anterior portion of the descending colon, the anterior portion of the ascending colon, the rectosigmoid junction, and the upper third and anterior wall of the middle third of the rectum. Subsites that are not covered by peritoneum include the posterior ascending colon, the posterior descending colon, and the lower third of the rectum also known as the rectal ampulla.