The soleus origin includes which of the following features?

• A. Lateral malleolus; distal fibula
• B. Soleal line; proximal, posterior surface of tibia and posterior aspect of head of fibula
• C. Medial malleolus
• D. Anterior surface of tibia

Answer: (B)

The main idea is where the soleus attaches at its origin. It originates from the posterior aspect of the leg, specifically the soleal line on the posterior surface of the tibia and the posterior aspect of the head of the fibula (proximal fibula). This combination anchors the muscle before it blends with the gastrocnemius to form the Achilles tendon for plantarflexion. The other landmarks listed are ankle bones or anterior surface areas that don’t serve as the soleus origin. So, the description that includes the soleal line with the proximal posterior tibia and the posterior head of the fibula best fits the soleus origin.