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quad·ri·ceps

n :  a large extensor muscle of the front of the thigh divided above into four parts which include the rectus femoris, vastus lateralis, vastus intermedius, and vastus medialis, and which unite in a single tendon to enclose the patella as a sesamoid bone at the knee and insert as the patellar ligament into the tuberosity of the tibia - called also quadriceps femoris , quadriceps muscle  .
 
 

 
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