), ▁or ▁ 2 0   mm ▁thick ▁in ▁young ▁athlet es ▁such ▁as ▁hand ball ▁players . ▁Typ ical ▁volume ▁is ▁around ▁ 3 0 0   cm ³ ▁in ▁non - active ▁individuals , ▁or ▁almost ▁ 5 0 0   cm ³ ▁in ▁athlet es . ▁ ▁Blood ▁supply ▁The ▁rect us ▁ab domin is ▁has ▁many ▁sources ▁of ▁ar ter ial ▁blood ▁supply . ▁ ▁Classification ▁of ▁the ▁v asc ular ▁an atom y ▁of ▁mus cles : ▁ ▁First , ▁the ▁inferior ▁ep ig astr ic ▁ar tery ▁and ▁ve in ▁( or ▁ve ins ) ▁run ▁superior ly ▁on ▁the ▁posterior ▁surface ▁of ▁the ▁rect us ▁ab domin is , ▁enter ▁the ▁rect us ▁fas cia ▁at ▁the ▁ar cu ate ▁line , ▁and ▁serve ▁the ▁lower ▁part ▁of ▁the ▁mus cle . ▁Second , ▁the ▁superior ▁ep ig astr ic ▁ar tery , ▁a ▁terminal ▁branch ▁of ▁the ▁internal ▁thor ac ic ▁ar tery , ▁supplies ▁blood ▁to ▁the ▁upper ▁portion . ▁Finally , ▁numerous ▁small ▁segment al ▁contributions ▁come ▁from ▁the ▁lower ▁six ▁inter cost al ▁ar ter ies ▁as ▁well . ▁ ▁N erve ▁supply ▁The ▁mus cles ▁are ▁inner v ated ▁by ▁thor aco - ab dom inal ▁n erves , ▁these ▁are ▁continu ations ▁of ▁the ▁T 7 - T 1 1 ▁inter cost al ▁n erves ▁and ▁pier ce ▁the ▁anterior ▁layer ▁of ▁the ▁rect us ▁she ath . ▁S ens ory ▁supply ▁is ▁from ▁the ▁ 7 - 1 2