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Cranial Nerves
Table 13.2
| Term | Definition |
|---|---|
| Olfactory Nerves | purely sensory; carry afferent impulses for sense of smell |
| Optic Nerves | purely sensory; carry afferent impulses for vision |
| Oculomotor Nerves | chiefly motor nerves; contain some proprioceptive afferents |
| Oculomotor Nerves (main def.) | somatic motor fibers to four of the six extrinsic eye muscles (inferior oblique and superior, inferior, and medial rectus muscles)direct eyeball, & to levator palpebrae superioris muscle, raises eyelid |
| Oculomotor Nerves | Parasympathetic (autonomic) motor fibers to sphincter pupillae (circular muscles of iris), cause pupil to contrict, and to ciliary muscle, controlling lens shape for visual focusin. some parasympathtic cell bodies are in the ciliary ganglia |
| Oculomotor Nerves | sensory (proprioceptor) afferents, run from same four extrinsic eye muscles to midbrain |
| Trochlear Nerves (main def.) | primarily motor nerves; supply somatic motor fibers to (and carry proprioceptor fibers from) one of the extrinsic eye muscles, the superior oblique muscle, which passes through the pulley-shaped trochlea |
| Trigeminal Nerves Opthalmic Division (V1) | conveys sensory impulses from skin of anterior scalp, upper eyelid, and nose, and from nasal cavity mucosa, cornea, and lacrimal glad |
| Trigeminal Nerves maxillary divison (V2) | conveys sensory impulses from nasal cavity mucosa palate, upper teeth, skin of cheek, upper lip, lower eyelid |
| Trigeminal Nerves madibular division (V3) | conveys sensory impulses from anterior tongue (except taste buds0, lower teeth, skin of chin, temporal region of scalp. supplies motor fibers to, and carries proprioceptor fibers from, muscles of mastication |
| Abducens Nerves | primarily motor; supply somatic fibers to lateral rectus muscle, an extrinsic muscle of the eye. convey proprioceptor impulses from same muscle to brain |
| Facial Nerves (main def.) | mixed nerves that are chief motor nerves, five major branches: temporal, zygomatic, buccal, mandibular, and cervical |
| Facial Nerves | convey motor impulses to skeletal muscle of face (muscles of facial expression), except for chewing muscles served by trigeminal nerves, and transmit proprioceptor impulses from same muscles to pons |
| Facial Nerves | transmit parasympathetic (autonomic) motor impulses to lacrimal (tear) glands, nasal and palatine glands, and submandibular and sublingual salivary glands. |
| Facial Nerves | convey sensory impulses from taste buds of anterior two-thirds of tongue; cell bodies of these sensory neurons are in geniculate ganglion |
| Vestibulocochlear Nerves | mostly sensory. vestibular branch transmits afferent impulses for sense of equilibrium. cochlear branch transmits afferent impulses for sense of hearing. small motor component adjusts to sensitivity of sensory receptors |
| Glossopharyngeal Nerves (main def.) | mixed nerves that innervate part of the tongue and pharynx. provide somatic motor fibers to and crry proprioceptors from. superior pharyngeal muscle elevates pharynx in swallowing. provide parasympathetic motor fibers to paratoid salivary glans |
| Glossopharyngeal Nerves | sensory fibers conduct taste and general senory (touch, pressure & pain) impulses from pharynx and posterior tongue, from chemoreceptors in the cartoid body from baroreceptors of cartoid sinus (monitor blood pressure) |
| Vagus Nerves | mixed nerves. nearly all motor fibers are parasympathetic efferents which supply heart, lungs and abdominal viscera and regulate breathing,heart rate and digestive activity. carry propericeptor fibers from muscles of larnyx and pharnyx |
| Accesory Nerves | mixed nerves, but primarily motor in function. supply motor fibers to trapezius and sternocleidomastoid muscles, together move head and neck, convey proprioceptor impulses from same muscles |
| Hypoglossal Nerves | mixed nerves, primarily motor in function, carry somatic motor fibers to intrinsic and extrinsic muscles of tongue, and proprioceptor fibers from the same muscles to brain stem. hypoglossal nerve control allows tongue movements |
Created by:
bwarren
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