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The gastrocnemius inserts at the calcaneous bone of the heel of the foot by way of the Achilles tendon. Achilles Tendon. Muscles insert to bone through their tendons. Muscle bundles are surrounded by filmy connective tissues. These connective tissues extend from the muscle and gather to form tendons. Tendons are denser and more fibrous than muscle.
The gastrocnemius branches at the top behind the knee; the two branches are known as the medial and lateral heads. The flexing of this muscle during walking and bending of the knee creates traction on the femur, pulling it toward the tibia in the lower leg and causing the knee to bend. Both the gastrocnemius muscle and the soleus join onto the Achilles tendon, which is the strongest and thickest tendon in the human body.