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Anatomy 7.1 p.250
| Question | Answer |
|---|---|
| Olfactory | Purely sensory; carries impulses for the sense of smell |
| Optic | Purely sensory; carries impulses for vision |
| Oculomotor | Supplies motor fibers to 4 of the 6 muscles (superior, inferior, and medial rectus, and inferior oblique) that direct the eyeball; to the eyelid; and to the internal eye muscles controlling lens shape and pupil size |
| Trochlear | Supplies motor fibers for one external eye muscle (superior oblique) |
| Trigeminal | Conducts sensory impulses from the skin of the face and mucosa of the nose and mouth; also contains motor fibers that activate the chewing muscles |
| Abducens | Supplies motor fibers to the lateral rectus muscle, which rolls the eye laterally |
| Facial | Activates the muscles of facial expression and the lacrimal and salivary glands; carries sensory impulses from the taste buds of anterior tongue |
| Vestibulocochlear | Purely sensory; vestibular branch transmits impulses for the sense of balance, and cochlear branch transmits impulses for the sense of hearing |
| Glossopharyngeal | Supplies motor fibers to the pharynx (throat) that promote swallowing and saliva production; carries sensory impulses from taste buds of the posterior tongue and from pressure receptors of the carotid artery |
| Vagus | Fibers carry sensory from and motor impulses to the pharynx, larynx, and the abdominal and thoracic viscera; most motor fibers are parasympathetic fibers that promote digestive activity and help regulate heart activity |
| Accessory | Mostly motor fibers that activate the sternocleidomastoid and trapezius muscles |
| Hypoglossal | Motor fibers control tongue movements; sensory fibers carry impulses from the tongue |