Soleus is a large muscle, deep to Gastrocnemius. Together the Gastrocnemius, Soleus, and Plantaris are known as Triceps Surae. Soleus is used constantly in standing to maintain an upright position.
- Origin: Upper half of the posterior surface of the tibia, along the soleal line.
Upper third of the posterior fibula. - Insertion: Posterior surface of the calcaneus via the Achilles tendon.
- Actions: Plantar flexion.
- Innervation: Tibial nerve.
- Daily uses: Standing upright.
- Example strengthening exercises: Seated calf raises.
- Example stretches: Soleus stretch.
- Related injuries: Calf strain.