The gastrocnemius muscle is the big muscle that makes the bulge at the back of the calf.
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The gastrocnemius has two heads. |
Knee flexion
The gastrocnemius works in concert with the thigh hamstrings to flex the knee.
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CLINICAL PUBLICATIONS
Gastrocnemius vs. soleus strain: how to differentiate and deal with calf muscle injuries. Dixon JB. Curr Rev Musculoskelet Med. 2009 Jun; 2(2): 74–77.