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rectus femoris O: anterior/ inferior iliac spine and superior acetabular femur and superior acetabular rim I:tibial tuberosity via patellar ligament A:flexes thigh and extends knee IV: femoral nerve L2-L4 vastus intermedius O: andterlateral femur and linea aspera (distal) I: tibial tuberosity via the patellar ligament A: extends knee IV: femoral nerve vastus lateralis O: anterolateral femur and linea aspera I: tibial tuberosity via the patellar ligament A: extends knee IV: femoral nerve L2-L4 vastus medialis O: linea aspera I: tibial tuberosity via the patellar ligament A: extends knee IV: femoral nerve L2-L4 biceps femoris O: ischial tuberosity and linea aspera I: head of fibula adn lateral condyle of tibia A: extends and laterally rotates thigh; flexes knee IV: sciatic nerve S1-S3 and common peroneal branch L5-S2 semimembranosus O: ischial tuberosity I: posterior and medial condyle of tibia A: extends and medially rotates thigh and flexes knee IV: sciatic nerve L5-S2 semitendinosus O: ischial tuberosity I: proximal and medial tibia A: extends and medially rotates thigh; flexes knee IV: sciatic nerve L5-S2 sartorius O: anterior/ superior iliac spine I: medial tibia near tibial tuberosity A: flexes and laterally rotates the thigh; flexes the knee IV: femoral nerve L2-L3 popliteus O: lateral condyle of femur I: posterior proximal shaft of tibia A: medially rotates tibia and laterally rotates thigh IV: tibial nerve L4-S1 gluteus maximus O: iliac crest, saccrum, coccyx andlubrodorsal fascia I: iliotibial tract and gluteal tuberosity of femur A: extends and laterally rotates thigh IV: inferior gluteal nerve L5-S2