anatomy

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ischiorectal fossa
- perianal space
- ischiorectal space
ischiorectal space

upper 2/3 of ischiorectal fossa
perianal space
- subcutaneous fat of buttocks
- ISS medially
- contains external hemorrhoidal plexus, subcutaneous EAS, lowest part of IAS, fiber of CLM
ISS
- between IAS, EAS
- most glands end here
submucous space
- between IAS and mucocutaneous lining of anal canal
- contains internal hemorrhoidal plexus
- contains muscularis submocosae ani
- ends at dentate line
- continues above with submucous layer of rectum
superficial post anal space
- between skin and anococcygeal ligament
- communicate posteriorly with ischiorectal fossa
deep postanal space
- retroshpincteric space of courtney
- between anococcygeal ligament and anococcygeal raphe
- communicate posteriorly with ischiorectal fossa
supralevator space
- peritoneum superiorly
- levators inferiorly
- medially rectum
- laterraly obturator f.
retrorectal space
- anterior: f. propria of rectum
- posterior: presacral f.
- lateral: lateral ligaments
- inferior: rectosacral ligament