Anatomy Chart courtesy of FCIT
On the front side of the lower leg is the Tibialis Anterior.
The Gastrocnemius is the calf muscle that is visible from the outside of the body. It attaches to the heel with the Achilles Tendon and originates behind the knee on the femur, crossing two joints.
The Gastrocnemius has two heads: the medial and the lateral. When fully developed, these two heads appear to form a diamond shape.
The Soleus is not visible when looking at the body from the outside as it lies underneath the Gastrocnemius on the rear of the lower leg. The Soleus is most active when doing calf exercises where the knee is bent, such as seated calf raises.
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