Which muscle is located on the lateral side of the leg and contributes to foot eversion?

• A. Gracilis
• B. Piriformis
• C. Fibularis Longus
• D. Soleus

Answer: (C)

The main idea here is understanding which muscle in the lateral leg group drives foot eversion. The fibularis longus sits on the outer (lateral) side of the leg, its tendon winds behind the lateral malleolus and under the foot to insert on the base of the first metatarsal and the medial cuneiform. From that position, it everts the foot at the subtalar joint and assists plantarflexion at the ankle. Its tendon also helps support the arches of the foot as it crosses under the sole, linking the lateral leg to the medial side of the foot. The other muscles listed are located in different regions or have different primary roles (gracilis in the medial thigh as an adductor, piriformis in the hip region as an external rotator, and soleus in the posterior leg mainly a plantarflexor). Thus, the fibularis longus best fits being on the lateral leg and contributing to foot eversion.