|the muscle in the back part of the leg that forms the greater part of the calf; responsible for the plantar flexion of the foot [syn: gastrocnemius]|
large posterior muscle of the calf of the leg. It originates at the back of the femur (thighbone) and patella (kneecap) and, joining the soleus (another muscle of the calf), is attached to the Achilles tendon at the heel. Action of the gastrocnemius pulls the heel up and thus extends the foot downward; the muscle provides the propelling force in running and jumping
Learn more about gastrocnemius muscle with a free trial on Britannica.com.