ides ▁the ▁space ▁into ▁two ▁tri angles : ▁ ▁The ▁anterior ▁u ro gen ital ▁triangle , ▁contains ▁the ▁pen is ▁( m ales ) ▁or ▁v ag ina ▁( f em ales ) ▁ ▁The ▁posterior ▁anal ▁triangle ▁containing ▁the ▁an us ▁ ▁The ▁formal ▁an atom ical ▁boundaries ▁of ▁the ▁per ine um ▁may ▁be ▁said ▁to ▁be : ▁ ▁in ▁front : ▁the ▁pub ic ▁arch ▁and ▁the ▁ar cu ate ▁lig ament ▁of ▁the ▁pub is ▁ ▁behind : ▁the ▁tip ▁of ▁the ▁c oc cy x ▁ ▁on ▁either ▁side : ▁the ▁inferior ▁r ami ▁of ▁the ▁pub is ▁and ▁is ch ial ▁tub eros ity , ▁and ▁the ▁sac rot uber ous ▁lig ament ▁ ▁superior ly : ▁pel vic ▁floor ▁ ▁inferior ly : ▁skin ▁and ▁fas cia ▁ ▁Per ine al ▁body ▁The ▁per ine al ▁body ▁( or ▁central ▁tend on ▁of ▁per ine um ) ▁is ▁a ▁py ram idal ▁fib rom us cular ▁mass ▁in ▁the ▁middle ▁line ▁of ▁the ▁per ine um ▁at ▁the ▁j unction ▁between ▁the ▁u ro gen ital ▁triangle ▁and ▁the ▁anal ▁triangle . ▁It ▁is ▁found ▁in ▁both ▁males ▁and ▁females . ▁In ▁males , ▁it ▁is ▁found ▁between ▁the ▁bul b ▁of ▁the ▁pen is ▁and ▁the ▁an us ; ▁in ▁females , ▁it ▁is ▁found ▁between ▁the ▁v ag ina ▁and ▁an us , ▁and ▁about ▁ 1 . 2 5   cm ▁in ▁front ▁of ▁the ▁latter . ▁ ▁The ▁per ine al