surae)

Morphology: Its two ends are called gastrocnemius muscle in shallow layer, and the other end is called soleus muscle in deep layer.

Starting and ending points: the medial and lateral heads of gastrocnemius muscle start from the medial and lateral condyles of femur; The soleus muscle begins behind the upper ends of tibia and fibula. The three heads meet, forming a swollen calf at the upper part of the calf, continuing down to the achilles tendon and ending at the calcaneal tubercle.

Function: Bend the calf and lift the heel. When standing, the ankle joint and knee joint can be fixed to prevent the body from leaning forward.