Accessory soleus muscle

In humans, the accessory soleus muscle is the most common accessory muscle in the ankle. Present in approximately 3% of people, this muscle usually appears as a distant belly, medial to the Achilles tendon. Clinically, the accessory soleus may be associated with pain and edema during periods of prolonged exercise. ...
Found on http://en.wikipedia.org/wiki/Accessory_soleus_muscle
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