IV Trochlear Nerves send motor impulses to one external eye muscle of each eye. Maxillary branches go to the upper jaw. Mandibular branches go to the lower jaw. VI Abducens Nerves innervate the muscles that turn the eye to the side. VII Facial Nerves innervate the facial muscles, salivary glands, lacrimal glands, and the sensation of taste on the anterior two-thirds of the tongue.
Vestibular branches are concerned with the sense of balance.
IX Glossopharyngeal Nerves innervate the parotid glands and the sense of taste on the posterior third of the tongue and part of the pharynx. X Vagus Nerves innervate part of the pharynx, larynx, vocal cords, and parts of the thoracic and abdominal viscera. XI Spinal Accessory Nerves innervate the shoulder muscles. Some fibers of these nerves arise from the spinal cord. XII Hypoglossal Nerves primarily innervate the muscles concerned with movements of the tongue.