Which muscle causes ankle flexion and inversion of the foot?

Which muscle causes ankle flexion and inversion of the foot?

• A. Gracilis
• B. Gastrocnemius
• C. Soleus
• D. Tibialis Anterior

Answer: (D)

The action pattern described—ankle dorsiflexion (lifting the foot upward) with inversion (turning the sole inward)—is carried out mainly by the tibialis anterior. This muscle runs along the front of the leg and crosses the ankle to insert on the medial side of the foot (medial cuneiform and base of the first metatarsal). When it contracts, it pulls the foot upward and also pulls the medial edge of the foot toward the midline, producing inversion. The other muscles listed don’t combine these actions: the gastrocnemius and soleus primarily plantarflex the ankle, gracilis is more about hip and knee actions, and tibialis posterior inverts but is more involved with plantarflexion rather than the dorsiflexion-and-inversion combo.

The action pattern described—ankle dorsiflexion (lifting the foot upward) with inversion (turning the sole inward)—is carried out mainly by the tibialis anterior. This muscle runs along the front of the leg and crosses the ankle to insert on the medial side of the foot (medial cuneiform and base of the first metatarsal). When it contracts, it pulls the foot upward and also pulls the medial edge of the foot toward the midline, producing inversion. The other muscles listed don’t combine these actions: the gastrocnemius and soleus primarily plantarflex the ankle, gracilis is more about hip and knee actions, and tibialis posterior inverts but is more involved with plantarflexion rather than the dorsiflexion-and-inversion combo.