The rectal mucosa above the anorectal junction is lined by pinkish red, insensitive columnar epithelium. Coronal section of rectum and anal canal. The interval between the internal and external sphincters may be marked by a white line. In front of anterior to the anal canal is the rectovesical fascia of Denonvilliersand behind posterior is the presacral endopelvic fascia of Waldeyerunder which lie a rich presacral plexus of veins. For the same reason, internal hemorrhoids can be intervened injected with sclerosant or ligated with rubber band without anesthesia. Moreover, the proposal that the puborectalis is a part of the external sphincter A. Join our Newsletter Thank you for subscribing!
The anal canal is surrounded by several perianal spaces:
Rectum and anal canal anatomy. Suspensory muscle Major duodenal papilla Minor duodenal papilla Duodenojejunal flexure Brunner's glands. Nixon, Surgery of the Anus. Unlike other portions of the colon, the rectum does not have taeniae coli. Fistula-in-ano can be intersphincteric, trans-sphincteric, or suprasphincteric.