Which muscle is located in the lateral compartment and contributes to eversion of the foot?

Which muscle is located in the lateral compartment and contributes to eversion of the foot?

• A. Extensor Digitorum Longus
• B. Soleus
• C. Tibialis Anterior
• D. Fibularis Longus

Answer: (D)

Muscles in the lateral compartment of the leg are the primary evertors of the foot. Fibularis longus sits on the outer leg, with its tendon passing behind the lateral malleolus and under the foot to insert on the base of the first metatarsal and the medial cuneiform, allowing it to pull the sole outward and contribute to eversion (and also assist plantarflexion). In contrast, extensor digitorum longus and tibialis anterior are in the anterior compartment and mainly dorsiflex the foot, while soleus is in the posterior compartment and mainly plantarflexes. So the fibularis longus is the muscle that fits both criteria: located in the lateral compartment and contributing to eversion.

Muscles in the lateral compartment of the leg are the primary evertors of the foot. Fibularis longus sits on the outer leg, with its tendon passing behind the lateral malleolus and under the foot to insert on the base of the first metatarsal and the medial cuneiform, allowing it to pull the sole outward and contribute to eversion (and also assist plantarflexion). In contrast, extensor digitorum longus and tibialis anterior are in the anterior compartment and mainly dorsiflex the foot, while soleus is in the posterior compartment and mainly plantarflexes. So the fibularis longus is the muscle that fits both criteria: located in the lateral compartment and contributing to eversion.