Which muscle causes foot eversion and lateral ankle extension?

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

Answer: (C)

Foot eversion and lateral ankle movement are driven by the muscles on the outer side of the leg, with the fibularis longus taking the lead. This muscle originates along the fibula, travels behind the outer ankle, and wraps under the foot to insert on the base of the first metatarsal and the medial cuneiform. Its pull everts the foot, and because it crosses the ankle, it also assists in plantarflexion, contributing to that lateral-tilting, toe-pointing action. It also helps support the transverse arch of the foot during weight bearing.

Gracilis acts at the hip and knee, not the ankle or foot. The gastrocnemius and soleus are strong plantarflexors but do not evert the foot; they mainly elevate the heel. Since eversion is the key action here, the fibularis longus is the best fit.