The soleus muscle is situated in the posterior compartment of the leg, forming part of the calf muscles. It is a large and powerful muscle that lies deep to the gastrocnemius.

Origin:
Originating from the posterior surfaces of the head and shaft of the fibula and the medial border of the tibia, the soleus takes its starting point from the bony structures of the lower leg.

Insertion:
The muscle inserts into the tendo calcaneus (Achilles tendon), which then attaches to the calcaneus (heel bone). This insertion site establishes a connection with the hindfoot.

Function:
Functionally, the soleus is a major plantarflexor of the ankle joint. It is actively involved in pointing the foot downward, as seen in activities like standing on tiptoes, walking, and running. Additionally, the soleus plays a crucial role in providing stability to the ankle joint during activities like maintaining a standing posture. It works synergistically with the gastrocnemius to execute powerful plantarflexion movements and is particularly active during the push-off phase of walking and running. The soleus is a key component of the calf muscles, contributing to the overall functionality of the lower leg.

Heel Raise (Calf Raise)

Seated Calf Raise