The soleus muscle is one of the calf muscles (triceps surae) in the superficial posterior compartment of the leg which sits deep to gastrocnemius. It is much bigger than gastrocnemius and is the primary plantar flexor.
- origin: fibula and medial border of the tibia (soleal line) via the inverted 'U' tendinous arch
- insertion: tendo calcaneus (Achilles tendon) into mid-posterior calcaneus
- action: plantar flexion
- arterial supply: sural arteries
- innervation: tibial nerve (sciatic nerve roots L5 to S2)
- antagonist: tibialis anterior
- key relationships
Accessory soleus muscle is an anatomical variant characterized by an additional distinct muscle encountered along a normal soleus muscle. Its prevalence varies from 0.7% to 5.5%, and it most commonly occurs as a unilateral finding .
- tibialis anterior muscle
- Musculus gastrocnemius
- Musculus plantaris
- Nervus ischiadicus