Medical Definition of biceps
plural biceps also bicepses
: a muscle having two heads: asa also biceps brachii \-ˈbrā-kē-ˌē, -ˌī\ play or biceps flexor cubiti \-ˈflek-ˌsȯr-ˈkyü-bə-ˌtī, -bət-ē\ play : the large flexor muscle of the front of the upper arm arising by its short head from the coracoid process and by its long head from the upper margin of the glenoid cavity and being inserted into the tuberosity of the radiusb or biceps femoris \-ˈfē-mə-rəs, -ˈfem-ə-\ play also biceps flexor cruris : the large flexor muscle of the back of the upper leg that arises by its long head from the tuberosity of the ischium and by its short head from the shaft of the femur, that is inserted into the head of the fibula, its tendon forming the outer hamstring, and that flexes the leg on the thigh and extends the thigh on the trunk
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