Cranial Nerve

  1. Olfactory nerve (CN I) – smell
  2. optic nerve (CN II) – vision
  3. oculomotor nerve (CN III) –controls eyes (no lateral or superior oblique movement) + levator palpebrae superioris (eyelid). parasympathetic nerve – circular muscle causing constriction
  4. trochlear nerve (CN IV) – assists eyeball movement (superior oblique muscle eyeball) smallest, only nerve origin in posterior aspect of the brain stem
  5. trigeminal nerve (CN V)
    – ophthalmic sensory – forehead, scalp, eyelids, nose Medial eye brow superior orbital fissure
    – maxillary sensory – maxilla & upper lip, upper teeth Inferior to orbit of eye Foramen rotundum
    – mandibular sensory – mandibular, cheek, lower lip, lower teeth, anterior 2/3 of  tongue (not taste) 

    inferior alveolar is numbed in dental work lower jaw motor – muscles of mastication

    Below lip inline with eye 

    Stimulate chewing without touching  teeth (then with touching teeth)

    Foramen ovale
  6. abducens nerve (CN VI) – Lateral eye movement
  7. facial nerve (CN VII)
    motor – face, check, scalp 

    special sensory – anterior 2/3 tongue and mouth 

    (taste)secretomotor (visceral) secretion from sublingual and  submandibular gland, nose glands 

    produces Bell’s palsy (can still wrinkle there forehead – then it is a  stroke (UMN) not Bell’s as the forehead in innervated by both  sides of the brain)

    Smile, sad, wrinkle forehead, blow  out cheeksinternal acoustic  


    facial canal 

    stylomastoid foramen

  8. vestibulocochlear nerve (CN VIII)
    – vestibular sensory – position/movement of head (vertigo)
    – cochlear 

    medulla o.

    sensory – hearing (tinnitus) 
  9. glossopharyngeal nerve (CN IX)sensory – posterior 1/3 tongue (taste), pharynx, baroreceptors in the carotid sinus, Touch and pain external ear motor – stylopharyngeus; assists swallowing. secretomotor – parotid salivary gland
  10. vagus nerve (CN X) –sensory – taste epiglottis, baroreceptors in the arch of aorta (BP, O2,  Co2 levels), thoracic and abdominal cavities. Proprioception  throat/voice box muscles motor – somatic muscles in throat and neck  parasympathetic – esophagus, stomach, small intestine,  large intestine, gallbladder, ↓ heart rate, glands of gastrointestinal  (GI) tract
  11. accessory nerve (CN XI) –
    Shoulder elevation and head-turning
  12. and hypoglossal nerve (CN XII) – Tongue movement
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