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The quadriceps femoris muscle is a four-headed muscle of the thigh which almost completely covers the femur. It ranks among the strongest muscles in the human body. It significantly forms the lateral contours and the ventral side of the thigh. Its innervation is carried by the femoral nerve. In detail the quadriceps consists of: Rectus femoris muscle, Vastus medialis muscle, Vastus lateralis muscle, and Vastu
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