Ischioanal fossa

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.

Ischioanal fossa
The perineum. The integument and superficial layer of superficial fascia reflected. (Ischiorectal fossa labeled at bottom left.)
The posterior aspect of the rectum exposed by removing the lower part of the sacrum and the coccyx (ischiorectal fossa labeled at bottom right)
Details
Identifiers
Latinfossa ischioanalis
TA98A09.5.04.001
TA22446
FMA22059
Anatomical terminology

Boundaries

It has the following boundaries:[1]

ANTERIOR
* fascia of Colles covering the Transversus perinei superficialis
* inferior fascia of the urogenital diaphragm(perineal membrane)
LATERAL
* tuberosity of the ischium
* Obturator internus muscle
* obturator fascia
SUPERIOR:
* Levator ani

INFERIOR:
* skin

MEDIAL:
* Levator ani
* Sphincter ani externus muscle
* anal fascia
POSTERIOR
* Gluteus maximus
* sacrotuberous ligament

Contents

The contents include:

See also

References

This article incorporates text in the public domain from page 425 of the 20th edition of Gray's Anatomy (1918)

  1. analtrianglesection - Ischiorectal fossa is colored yellow

Additional images

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