posterior compartment of the thigh

semimembranosus origin

ischial tuberosity

semimembranosus insertion

medial condyle of tibia

semimembranosus action

extends and IR hip, flexes knee, IR when flexed

semimembranosus nerve

tibial division of sciatic nerve (L5, S1, S2)

semitendinosus origin

ischial tuberosity

semitendinosus insertion

superior aspect of medial surface of tibia

semitendinosus action

extends and IR hip, flexes knee, IR when flexed

semitendinosus nerve

tibial division of sciatic nerve (L5, S1, S2)

biceps femoris long head origin

ischial tuberosity

biceps femoris short head origin

lateral lip of linea aspera

biceps femoris insertion

head of fibula

biceps femoris action

flexes knee, ER when flexed

biceps femoris long head action

extends hip

biceps femoris long head nerve

tibial division of sciatic nerve (L5, S1, S2)

biceps femoris short head nerve

common fibular division of sciatic nerve (L5, S1, S2)