cranial nerves

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Author:
swasdo
ID:
265307
Filename:
cranial nerves
Updated:
2014-03-06 02:16:37
Tags:
bio241
Folders:
bio241
Description:
cranial nerves chapter 13
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  1. cranial nerve I
    • name: olfactory nerve
    • function: purely sensory; carry afferent impulses for sense of smell
  2. cranial nerve II
    • name: optic nerves
    • function: purely sensory; carry afferent impulses for vision
  3. cranial nerve III
    • name: oculomotor nerves
    • function: chiefly motor nerves to the eye; contain a few proprioceptive afferents
  4. cranial nerve IV
    • name: trochlear nerves
    • function: primarily motor nerves; supply somatic motor fibers to one of the extrinsic eye muscles, superior oblique muscle, which passes through the pulley shaped trochlea
  5. cranial nerve V
    • name: trigeminal nerve
    • function: conveys sensory impulses from skin of anterior scalp, upper eyelid, and nose, and from the nasal cavity mucosa, cornea, and lacrimal gland
  6. cranial nerve VI
    • name: abducens nerves
    • function: primarily motor; supply somatic motor fibers to lateral rectus muscle, an extrinsic muscle of the eye. convey proprioceptor impulses from same muscle to the brain
  7. cranial nerve VII
    • name: facial nerves
    • function: mixed nerves that are the chief motor nerves of face. five major branches: temporal, zygomatic, buccal, mandibular, and cervical
  8. cranial nerve VIII
    • name: vestibulocochlear nerves
    • function: mostly sensory; vestibular branch transmits afferent impulses for sense of equilibrium, and sensory nerve cell bodies are located in vestibular ganglia. cochlear branch transmits afferent impulses for sense of hearing, and sensory nerve cell bodies are located in spiral ganglion within cochlea
  9. cranial nerve IX
    • name: glossopharyngeal nerves
    • function: conduct taste and general sensory impulses from pharynx and posterior tongue, from chemoreceptors in carotid body
  10. cranial nerve X
    • name: vagus nerves
    • function: mixed nerves; nearly all motor fibers are parasympathetic efferents, except those serving skeletal muscles of pharynx and larynx. parasympathetic motor fibers supply heart, lungs, and abdominal viscera and are involved in regulating heart rate, breathing, and digestive system activity
  11. cranial nerve XI
    • name: accessory nerves
    • function: mixed nerves but primarily motor in function; supply motor fibers to trapezius and sternocleidomastoid muscles, which together move head and neck and convey proprioceptor impulses from same muscles
  12. cranial nerve XII
    • name: hypoglossal nerves
    • function: mixed nerves, but primarily motor in function; carry somatic motor fibers to intrinsic and extrinsic muscles of tongue and proprioceptor fibers from same muscles to brain stem; allows tongue movements that mix and manipulate food during chewing, contribute to swallowing and speech.

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