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Ischioanal fossa
Wedge-shaped space located lateral to the anal canal and inferior to the pelvic diaphragm From Wikipedia, the free encyclopedia
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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.
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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: | MEDIAL: * Levator ani * Sphincter ani externus muscle * anal fascia |
POSTERIOR * Gluteus maximus * sacrotuberous ligament |
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Contents
The contents include:
- Inside Alcock's canal, on the lateral wall
- 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
See also
References
Additional images
External links
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