Rectus femoris+
anterior thigh; quadriceps+
extension of leg at knee
Vastus lateralis+
lateral anterior thigh; quadriceps+
extension of leg at knee
Vastus Medialis+
medial anterior thigh; quadriceps+
extension of leg at knee
Vastus intermedius+
deep anterior thigh; quadriceps+
extension of leg at knee
Sartorius (*)
parallel strap-like muscle that crosses thigh
flexion of knee forward
Biceps femoris*
posterior thigh; hamstring*
flexion of leg at knee
Semitendinosus*
posterior thigh; hamstring*
flexion of leg at knee
Semimembranosus*
posterior thigh; hamstring*
flexion of leg at knee
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the agonist muscle or prime mover is the gluteus maximus in hip extention and in hip flexion the hip flexors is the agonist muscle.
Vastus medialis, vastus intermedius, vastus lateralis, rectus femoris. Together, they are the quadriceps femoris.