▁the ▁sci atic ▁n erve . ▁ ▁The ▁sci atic ▁n erve ▁branches ▁into ▁the ▁deep ▁fib ular ▁n erve ▁and ▁the ▁tib ial ▁n erve . ▁ ▁The ▁tib ial ▁n erve ▁inner v ates ▁the ▁sem it end inos us ▁as ▁well ▁as ▁the ▁other ▁ham string ▁mus cles , ▁the ▁sem im emb ran os us ▁and ▁b ice ps ▁fem oris . ▁ ▁Function ▁The ▁sem it end inos us ▁mus cle ▁is ▁one ▁of ▁three ▁ham string ▁mus cles ▁that ▁are ▁located ▁at ▁the ▁back ▁of ▁the ▁th igh . ▁The ▁other ▁two ▁are ▁the ▁sem im emb ran os us ▁mus cle ▁and ▁the ▁b ice ps ▁fem oris . ▁The ▁sem it end inos us ▁mus cle ▁lies ▁between ▁the ▁other ▁two . ▁These ▁three ▁mus cles ▁work ▁collect ively ▁to ▁flex ▁the ▁kne e ▁and ▁extend ▁the ▁hip . ▁ ▁The ▁mus cle ▁also ▁helps ▁to ▁med ial ly ▁rotate ▁the ▁tib ia ▁on ▁the ▁fem ur ▁when ▁the ▁kne e ▁is ▁flex ed ▁and ▁med ial ly ▁rotate ▁the ▁fem ur ▁when ▁the ▁hip ▁is ▁extended . ▁It ▁counter act s ▁forward ▁b ending ▁at ▁the ▁h ips ▁as ▁well . ▁ ▁C lin ical ▁significance ▁ ▁Al ong ▁with ▁pat ell ar ▁lig ament ▁and ▁quadr ice ps ▁fem oris , ▁sem it end inos us / g rac ilis ▁( ST G ) ▁tend on ▁aut og raft s ▁has ▁been ▁used ▁commonly ▁and ▁successfully ▁for ▁anterior ▁cru ci ate ▁lig ament