Which muscle is primarily responsible for the movement of the ankle joint?

The gastrocnemius is primarily responsible for the movement of the ankle joint due to its anatomical position and function. This muscle is located in the posterior compartment of the lower leg and plays a significant role in plantarflexion, which is the action of pointing the toes downward. When the gastrocnemius contracts, it pulls on the Achilles tendon, which in turn facilitates this movement at the ankle joint.

In terms of its significance, the gastrocnemius is not only involved in walking, running, and jumping but also contributes to maintaining balance and stability during various movements. Its dual role as a muscle that crosses both the knee and ankle joints allows it to assist in knee flexion while simultaneously influencing ankle position.

The other muscles listed are not primarily involved in ankle movement. The levator scapulae is located in the neck and is involved in movements of the scapula, the deltoids are shoulder muscles responsible for arm movements, and the pectoralis minor primarily supports arm movements and stabilizes the scapula. None of these muscles have a direct role in the function of the ankle joint.