#MuscleMonday! Today lets talk about the Gastrocnemius!
The Gastrocnemius is a powerful superficial two-headed muscle that is in the back part of the lower leg of humans. It runs from its two heads just above the knee to the heel. The lateral head originates from the lateral condyle of the femur, while the medial head originates from the medial condyle of the femur. Its other end forms a common tendon with the Soleus muscle; this tendon is known as the Calcaneal Tendon or Achilles Tendon and inserts onto the posterior surface of the calcaneus, or heel bone.
The function of the Gastrocnemius is to plantar flex (point) the foot at the ankle joint as well as flex the knee. This muscle is used more in running than in standing or walking due to the predominance of white muscle fibers (fast-twitch). Whereas, the Soleus muscle is primarily red muscle fibers (slow-twitch) which works more in standing and walking.