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Four According to Wikipedia: The quadriceps femoris (quadriceps, quadriceps extensor, guads or quads) includes the four prevailing muscles on the front of the thigh. It is the great extensor muscle of the knee, forming a large fleshy mass which covers the front and sides of the femur. It is subdivided into separate portions, which have received distinctive names. * Rectus femoris occupies the middle of the thigh, covering most of the other three quadriceps muscles. It originates on the ilium. It is named from its straight course. * The other three lie deep to rectus femoris and originate from the body of the femur, which they cover from the trochanters to the condyles: ** Vastus lateralis is on the lateral side of the femur. ** Vastus medialis is on the medial side of the femur. ** Vastus intermedius lies between vastus lateralis and vastus medialis on the front of the femur

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