NCBI Bookshelf. Abdelwahab Ahmed ; Waqar A. Authors Abdelwahab Ahmed 1 ; Waqar A. Qureshi 2. The anal canal, thought of mostly as the final exit for what we ingest, is more intricate a structure than most would believe. At an average of 2.
The Anal Canal
Anatomy, Abdomen and Pelvis, Anal Canal - StatPearls - NCBI Bookshelf
The anal canal is the terminal segment of the large intestine between the rectum and anus , located below the level of the pelvic diaphragm. It is located within the anal triangle of perineum , between the right and left ischioanal fossa. As the final functional segment of the bowel, it functions to regulate release of excrement by two muscular sphincter complexes. The aperture at the terminal portion of the anal canal is known as the anus.
Anatomically, the anal canal is referred to as the terminal alimentary tract between the dentate line and anal verge. However, histologically it extends more proximally and includes the columns of Morgagni and anal sinuses. Surgically, the anal canal is referred to as the portion of bowel between the anorectal sling and the anal verge. The anal margin is arbitrarily defined as the 5 cm of skin radius surrounding the anal verge. The anal canal is a muscular tube, just like the rest of the gastrointestinal tract, but the difference being is that the muscular layer is circular forming the external and internal anal sphincters.