Anal Anatomy

The anal canal is the final segment of the gastrointestinal tract. The anal canal is 25 to 4 cm 1 to 15 inches in length.

Fistula In Ano Background Anatomy Etiology

In this article we shall look at the anatomy of the anal canal its position structure relations and neurovascular supply.

Anal anatomy. The lower third of the anal canal is supplied by. Anatomically the anal canal extends from the level of the upper aspect of the pelvic diaphragm to the anus. This is followed by the anal canal which leads to the anal verge which is the junction on the outside of the anus of hair bearing and non hair bearing skin similar to the junction of the lip of the mouth with the skin of the face.

The rectum is a continuation of the sigmoid colon and connects to the anus. Beyond the verge traveling outwards for 2 inches is the perianal skin. The lower 13 of the anal canal is lined by stratified squamous epithelium that blends with the skin.

An endoscope is inserted into the anus and the entire colon is viewed to look. It has an important role in defecation and maintaining faecal continence. In surgical usage however the anal canal is frequently limited to that part of the intestine below the pectinate line.

The rectum is a part of the lower gastrointestinal tract. Anus tests physical examination. The anal canal is the most terminal part of the lower gi tractlarge intestine which lies between the anal verge anal orifice anus in the perineum below and the rectum above.

The rectum follows the shape of the sacrum and ends in an expanded section called the rectal ampulla where feces are stored before their release via the anal canal. Anatomy of the anus. Its diameter is narrower than that of the rectum to which it connects.

Its mucosa is lined by simple columnar epithelium. A doctor may inspect the outside of the anus. Anal canal the terminal portion of the digestive tract distinguished from the rectum because of the transition of its internal surface from a mucous membrane layer endodermal to one of skinlike tissue ectodermal.

The description in this topic is from below upwards as that is how this region is usually examined in clinical practice. An endoscope flexible tube with a lighted camera on its tip is inserted into. This part differs from the part above the pectinate line in several respects including innervation.

Structure the upper 23 has longitudinal folds or elevations of tunica mucosa.

Anal Sphincter Anatomy Pi Uptodate