Muscles of posterior group of thigh

Muscles of posterior group of thigh

Muscle	Origin	insertion	nerve	action	comment
Posterior: Hamstrings
Semitendinosus	Ischial tuberosity	Proximal medial tibia(pes anserinus)	Sciatic(tibial)	Extend thigh, flex leg	Tendon used in ligament reconstruction(ACL)
Semimembranosus	Ischial tuberosity	Posterior medial tibial condyle	Sciatic(tibial)	Extend thigh, flex leg	A border in medial approach
Biceps femoris: long head	Ischial tuberosity	Head of fibula	Sciatic(tibial)	Extend thigh, flex leg	Can avulse front origin(avulsion fx)
Biceps femoris: short head	Linea aspera, supracondylar line	Fibula, lateral tibia	Sciatic(peroneal)	Extend thigh, flex leg	Share tendon insertion with long head

Ref) Netter’s concise orthopaedic anatomy P268