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vastus lat·er·a·lis

n :  the division of the quadriceps muscle that covers the outer anterior aspect of the femur, arises chiefly from the femur, and inserts into the outer border of the patella by a flat tendon which blends with that of the other divisions of the muscle and sends an expansion to the capsule of the knee - called also vastus externus  .
 
   

 
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Rangely District Hospital (Rangely, Colorado - Rio Blanco County)