Which muscle is not a primary mover in ankle plantarflexion?

Which muscle is not a primary mover in ankle plantarflexion?

• A. Tibialis anterior
• B. Gastrocnemius
• C. Soleus
• D. Flexor digitorum longus

Answer: (A)

Plantarflexion at the ankle is driven mainly by the muscles of the posterior leg that pull the heel upward, especially the gastrocnemius and the soleus. They are the primary movers because they generate the strongest downward push of the foot. The flexor digitorum longus can assist in plantarflexion while also flexing the toes, but it’s not the primary driver. The tibialis anterior, located in the front of the leg, mainly dorsiflexes the ankle (pulls the foot upward) and inverts the foot, acting as the antagonist to plantarflexion rather than as a main plantarflexor. So the muscle that is not a primary mover in ankle plantarflexion is the tibialis anterior.

Plantarflexion at the ankle is driven mainly by the muscles of the posterior leg that pull the heel upward, especially the gastrocnemius and the soleus. They are the primary movers because they generate the strongest downward push of the foot. The flexor digitorum longus can assist in plantarflexion while also flexing the toes, but it’s not the primary driver. The tibialis anterior, located in the front of the leg, mainly dorsiflexes the ankle (pulls the foot upward) and inverts the foot, acting as the antagonist to plantarflexion rather than as a main plantarflexor. So the muscle that is not a primary mover in ankle plantarflexion is the tibialis anterior.