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Muscle Origin Insertion Action Nerve
articularis genus distal anterior femur (superior to knee) knee joint capsule (synovial membrane) pulls knee joint capsule superior with knee extension; prevents impingement of synovial membrane between patella & femur femoral nerve (L3, L4)
rectus femoris anterior head: anterior inferior iliac spine (AIIS); posterior head: just superior to rim of acetabulum (supra-acetabular groove) tibial tuberosity (via common quadriceps tendon & patellar ligament) extension of leg (at knee joint); flexion of thigh (at hip joint) femoral nerve (L2 ,L3, L4)
sartorius anterior superior iliac spine (ASIS) proximal anteromedial tibia (pes anserine) flexion, abduction & lateral rotation of thigh (at hip joint); flexion of leg (at knee joint); anterior pelvic tilt femoral nerve (L2, L3)
tensor fascia latae anterior superior iliac spine (ASIS) & anterior aspect of iliac crest iliotibial band (below greater trochanter) flexion, abduction & medial rotation of thigh (at hip joint); tenses iliotibial band to support femur on tibia during standing superior gluteal nerve (L4, L5, S1)
vastus intermedius anterior lateral surface of femur tibial tuberosity (via common quadriceps tendon & patellar ligament) extension of leg (at knee joint) femoral nerve (L2 ,L3, L4)
vastus lateralis lateral lip of linea aspera (also intertrochanteric line & lateral intermuscular septum) tibial tuberosity (via common quadriceps tendon & patellar ligament) extension of leg (at knee joint) femoral nerve (L2 ,L3, L4)
vastus medialis medial lip of linea aspera (intertrochanteric line) tibial tuberosity (via common quadriceps tendon & patellar ligament) extension of leg (at knee joint) femoral nerve (L2 ,L3, L4)

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