quadriceps femoris 
[kwod′riseps]
Etymology: L, quattuor, four, caput, head, femur, thigh
the large extensor muscle of the anterior thigh, composed of the rectus femoris, the vastus lateralis, the vastus medialis, and the vastus intermedius. The quadriceps forms a large dense mass covering the front and sides of the femur. Tendons of the four parts of the muscle unite at the distal part of the thigh, forming a single strong tendon that embeds the patella and inserts onto the tibial tuberosity. The muscle functions to extend the leg.
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Quadriceps femoris group of thigh muscles
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