▁▁ 1 ) ▁skin ▁▁ 2 ) ▁super f icial ▁per ine al ▁fas cia : ▁Sub cut aneous ▁t issue ▁divided ▁into ▁two ▁layers : ▁( a ) ▁A ▁super f icial ▁fat ty ▁layer , ▁and ▁( b ) ▁Col les ' ▁fas cia , ▁a ▁deeper , ▁memb ran ous ▁layer ▁▁ 3 ) ▁deep ▁per ine al ▁fas cia ▁and ▁mus cles : ▁▁▁ 4 ) ▁fas cia ▁and ▁mus cles ▁of ▁pel vic ▁floor ▁( lev ator ▁ani , ▁c oc cy ge us ) ▁ ▁Are as ▁The ▁region ▁of ▁the ▁per ine um ▁can ▁be ▁considered ▁a ▁distinct ▁area ▁from ▁pel vic ▁cav ity , ▁with ▁the ▁two ▁regions ▁separated ▁by ▁the ▁pel vic ▁dia ph rag m . ▁ ▁The ▁following ▁areas ▁are ▁thus ▁class ified ▁as ▁parts ▁of ▁the ▁per ine al ▁region : ▁ ▁per ine al ▁p ouch es : ▁super f icial ▁and ▁deep ▁( see ▁above ▁for ▁details ) ▁ ▁is chio anal ▁f ossa   – ▁a ▁fat - filled ▁space ▁at ▁the ▁later al ▁sides ▁of ▁anal ▁canal , ▁bounded ▁later ally ▁by ▁the ▁obt ur ator ▁intern us ▁mus cle , ▁and ▁med ial ly ▁by ▁the ▁pel vic ▁dia ph rag m ▁and ▁anal ▁canal ; ▁its ▁base ▁is ▁the ▁skin ▁ ▁anal ▁canal ▁ ▁p ud end al ▁canal   – ▁contains ▁internal ▁p ud end al ▁ar tery ▁and ▁the ▁p ud end al ▁n erve ▁ ▁C lin ical ▁significance ▁ ▁Ext ensive