The quadriceps femoris is composed of three "vastus" muscles and the

The quadriceps femoris is composed of three "vastus" muscles and the rectus femoris 
A muscle with the ancestor from the shaft of the femur, with insertion into the tibial tuberosity, with nerve supply from the femoral nerve, and whose action extend the leg. 

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They use the si unit, or metric system its all the same thing