Foot anatomy, artwork. The muscle across the side of the foot is the abductor hallucis. Beneath it is flexor digitorum brevis muscle, which acts to flex the first four toes. At left is the calcaneus (heel) bone. At upper left is the tibia (shinbone). To its left 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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