Cranial Nerves

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Cranial Nerves
2010-11-22 21:36:48
brain nerves nervous system cranial peripheral sensory somatic autonomic

Function(s) of each of the 12 pairs of cranial nerves
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  1. I. Olfactory
    Sensory impulses of sense of smell
  2. II. Optic
    Sensory impulses of vision
  3. III. Occulomotor
    • -Directs eyeball, raises eyelid (somatic)
    • -constricts pupil (autonomic)
    • -contains proprioceptors (sensory)
  4. IV. Trochlear
    Controls supraorbital oblique muscle of the eye (motor)
  5. V. Trigeminal
    3 divisions:

    • V1-sensory impulses from skin of anterior scalp, upper eyelid, nose, nasal cavity mucosa, lacrimal glands
    • V2-sensory impulses form nasal cavity mucosa, palate, upper teeth, lower eyelid
    • V3-sensory impulses from anterior tongue, lower teeth, skin of chin, temporal region of scalp
  6. VI. Abducens
    Somatic motor fibers to lateral rectus
  7. VII. Facial
    Innervates facial expression; chief motor nerves of face, parasympathetic impulses to glands in face (lacrimal, salivary, etc.), sensory impulses from taste buds
  8. VIII. Vestibulocochlear
    Impulses for sense of equilibrium, sense of hearing
  9. IX. Glossopharyngeal
    Somatic motor fibers and proprioceptors to stylopharyngeus (elevates pharynx in swallowing), parasympathetic motor fibers for taste and general sensory to pharynx and posterior tongue, chemoreceptors in carotid body
  10. X. Vagus
    Mostly parasympathetic nerves; supplies heart, lungs and abdominal viscera, help regulate heart rate, breathing, and digestive activity; sensory impulses from thoracic and abdominal viscera, tastebuds of posterior tongue, pharynx
  11. XI. Accessory
    Motor fibers and proprioceptors to trapezius and sternocleidomastoid (which move head and neck)
  12. XII. Hypoglossal
    Motor fibers and proprioceptors to muscles of tongue