Foot anatomy, artwork. The muscles on the sole of the foot are the digiti minimiis (left) and the flexor digitorum brevis muscle (right), which acts to flex the first four toes. At right is the calcaneus (heel) bone. At upper right is the fibula (lower leg bone). To its right are the soleus and gastrocnemius calf muscles. Attached to the gastrocnemius muscle and the calcaneus bone is the Achilles tendon (white). The Achilles tendon is the largest and strongest tendon in the human body, it connects the heel bone to the calf muscles.
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