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Ischioanal fossa

Wedge-shaped space located lateral to the anal canal and inferior to the pelvic diaphragm

Summary

Wedge-shaped space located lateral to the anal canal and inferior to the pelvic diaphragm

FieldValue
NameIschiorectal fossa
Latinfossa ischioanalis
ImageGray405.png
CaptionThe perineum. The integument and superficial layer of superficial fascia reflected. (Ischiorectal fossa labeled at bottom left.)
Image2Gray1077.png
Caption2The posterior aspect of the rectum exposed by removing the lower part of the sacrum and the coccyx (ischiorectal fossa labeled at bottom right)

The ischioanal fossa (formerly called ischiorectal fossa) is the fat-filled wedge-shaped space located lateral to the anal canal and inferior to the pelvic diaphragm. It is somewhat prismatic in shape, with its base directed to the surface of the perineum and its apex at the line of meeting of the obturator and anal fasciae.

Boundaries

It has the following boundaries:

POSTERIOR
* Gluteus maximus
* sacrotuberous ligament

Contents

The contents include:

  • Inside Alcock's canal, on the lateral wall
    • internal pudendal artery
    • internal pudendal vein
    • pudendal nerve
  • Outside Alcock's canal, crossing the space transversely
    • inferior rectal artery
    • inferior rectal veins
    • inferior anal nerves
    • fatty tissue across which numerous fibrous bands extend from side to side allows distension of the anal canal during defecation

References

Additional images

File:Gray407.png|Coronal section of anterior part of pelvis, through the pubic arch. Seen from in front. File:Gray542.png|The superficial branches of the internal pudendal artery.

References

  1. {{NormanAnatomyFig. analtrianglesection - Ischiorectal fossa is colored yellow
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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