Hamstring Muscles

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Hamstring MusclesOriginInsertionActionNerve rootsNerves
Biceps Femorislong head: medial facet of the ischial tuberosity short head: lateral linea aspera and lateral supracondylar line of the femur and adjacent intermuscular septumfibular head, crural fascia and lateral tibial condyle (common short and long head tendon)flexes knee joint

laterally rotates knee joint (when the knee is flexed) extends hip joint (long head only)

external rotation of the thigh (long head only)
L5
S1
S2
long head: Tibial Nerve
short head: Common Peroneal Nerve
SemimembranosusIschial tuberosityInfraglenoid tubercle of the posterior medial tibial condyle, posterior joint capsule (contributing to the oblique popliteal ligament), popliteal fascia and posterior horn of medial meniscusFlexes knee joint, medially rotates knee joint (when the knee is flexed beyond 90 degrees), extends hip joint (less than biceps femoris)L5
S1
S2
Tibial Nerve
SemitendinosusIschial tuberosityAs part of the pes anserine tendon, onto the medial superior tibiaflexes knee joint, medially rotates knee joint (when the knee is flexed beyond 90 degrees), extends hip joint (less than biceps femoris)L5
S1
S2
Tibial Nerve