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From Biology-Online Dictionary | Biology-Online Dictionary
(Science: anatomy, muscle) origin, by four heads: rectus femoris, vastus lateralis, vastus intermedius, and vastus medialis; insertion, patella, and thence by ligamentum patellae to tuberosity of tibia; action, extends leg; flexes thigh by action of rectus femoris; nerve supply, femoral.
Synonym: musculus quadriceps femoris, musculus quadriceps extensor femoris, quadriceps muscle of thigh.