The brainstem primarily controls mouth movement.
The brainstem, located in the middle of the brain, plays a crucial role in controlling fundamental bodily functions. Specifically, the region encompassing the midbrain, pons, and medulla within the brainstem governs movements of the eyes, face, and mouth. These movements include actions such as speech, chewing, swallowing, and facial expressions. Different cranial nerves that originate in the brainstem innervate the muscles of the face and mouth and send motor signals to control these movements.
Therefore, while other brain regions may influence or modulate mouth movements, the brainstem serves as the primary control center.
