The soleus is a thick muscle located on the back of the lower leg. It originates from the upper part of the fibula (lower leg bone) and the tendonous arch connecting the head of the fibula to the tibia. The muscle is thickest at its mid-section where its flattened form curves around the deep flexor muscles of the foot and toes. The muscle tapers low, just above the ankle, and its tendon continues on inserting in the middle part of the calcaneum (heel bone). This muscle is used to point the foot or raise the heel, which lifts the body. Continuous contraction prevents the body from falling forward when standing.