cranial nerves
Terms
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- olfactory
- purely sensory- carries afferent impulses associated w/ sense of smell
- optic
- purely sensory- carries afferent impulses associated w/ vision
- oculomotor
- primarily motor- somatic motor fibers to inferior oblique and superior, inferior, and medial rectus muscles, which direct the eyeball, and to levator palpebrae muscles of the superior eyelid; parasympathetic fibers to iris and smoot muscle controlling lens shape
- trochlear
- primarily motor- probides somatic motor fibers to superior oblique muscle
- Trigeminal
- Mixed- major sensory nerve of face; conducts sensory impulses from skin of face and anterior scalp, from mucosae of mouth and nose, and from surface of the eyes; madibular division also contains motor fibers that innervate muscles of mastication and muscle of floor of mouth
- Abducens
- carries motor fibers to lateral rectus of the eye
- hypoglossal
- mixed (primarily motor in function) carries somatic motor fibers to tongue muscles
- facial
- Mixed- supplies somatic motor fibers to muscles of facial expression and parasympathetic motor fibers of lacrimal and salivary glands; carries sensory fibers from taste receptors of anterior portion of the tongue
- vestibulocochlear
- purely sensory- vestibular branc transmits impulses accociated w/ equillibrium from vestibular apparatus and semicircular canals; cochlear branch transmits impulses associated w/ hearing from the cochlea
- glossopharyngeal
- mixed- somatic motor fibers serve pharyngeal muscles, and parasympathetic motor fibers serve salivary glands; sensory fibers carry impulses from pharynx, tonsils, posterior tongue (taste buds) and chemoreceptor and pressure receptors of the carotid artery
- vagus
- mixed- fibers carry somatic motor impulses to pharynx and larynx and sensory fibers from same structures; vary large porion is composed of parasympathetic motor fibers which supply heart and smooth muscles of abdominal visceral organs; transmits sensory impulses from viscera
- accessory
- mixed- but primarily motor in function- provides somatic motor fibers to sternocleidomastoid and trapezius muscle and to muscles of the soft palate, pharynx, and larynx (spinal and medullary fibers respectively)