Ischioanal fossa

The ischiorectal fossa (or ischioanal fossa) 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:

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