The triceps surae is located in the posterior group of the calf and is the main muscle of the calf. It is composed of the gastrocnemius and the soleus.

Shape: Its two heads are located superficially and are called the gastrocnemius muscle, and the other head located deeper is the soleus muscle.

Origin and insertion point: The medial and lateral heads of the gastrocnemius muscle originate from the medial and lateral condyles of the femur, and migrate to become tendon structures at approximately the midpoint of the calf; the soleus muscle originates from the posterior part of the upper end of the tibia and fibula and the soleus muscle of the tibia. line, the muscle bundles are transformed downward into tendons. The three heads meet to form a swollen calf on the upper part of the calf, which continues downward into the Achilles tendon and ends at the calcaneal tubercle.

Function: Flex the calf and lift the heel. When standing, it can fix the ankle and knee joints to prevent the body from falling forward.