Anal canal

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Overview

Anal canal
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Coronal section of rectum and anal canal.
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Coronal section through the anal canal. B. Cavity of urinary bladder V.D. Ductus deferens. S.V. Seminal vesicle. R. Second part of rectum. A.C. Anal canal. L.A. Levator ani. I.S. Sphincter ani internus. E.S. Sphinear ani externus.
Latin canalis analis
Gray's subject #249 1184
Artery inferior rectal artery
Vein inferior rectal vein
Lymph superficial inguinal lymph node (below pectinate line) internal iliac lymph nodes (above line)
MeSH Anal+Canal
Dorlands/Elsevier c_04/12208538

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The anal canal is the terminal part of the large intestine.

It is situated between the rectum and anus, below the level of the pelvic diaphragm. It lies in the anal triangle of perineum in between the right and left ischiorectal fossae.

In humans it is approximately 2.5 to 4 cm long, extending from the anorectal junction to the anus. It is directed downwards and backwards. It is surrounded by inner involuntary and outer voluntary sphincters which keep the lumen closed in the form of an anteroposterior slit.

It is differentiated from the rectum by the transition of the internal surface from endodermal to skinlike ectodermal tissue.

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