Ischiorectal fossa

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Ischiorectal fossa

a wedge-shaped space with its base toward the perineum and lying between the tuberosity of the ischium and the obturator internus muscle laterally and the external anal sphincter and the levator ani muscle medially.

Synonym: fossa ischiorectalis, ischioanal fossa, Velpeau's fossa.

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