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.
Additional images
 Anatomy of the anus and rectum |
 Left Levator ani from within. |
 The interior of the anal cami and lower part of the rectum. |
 Median sagittal section of male pelvis. |
 Median sagittal section of female pelvis. |
See also
External links
- Norman/Georgetown pelvis
- SUNY Figs 44:05-00 - "The rectum and anal canal in the male pelvis."
- Anal+canal at eMedicine Dictionary
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
