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20 Cards in this Set
- Front
- Back
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cranial nerve serve as
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bridge between PNS and CNS
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3 main functions of CN
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motor, sensory, parasympathetic
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most CN are visible in what view
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ventral (anterior) - except CN 4 which can be best seen in lateral view
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CN nuclei (cell bodies) - origin of CN are dist. in
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brainstem
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CN innervate external ear skin
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5,7,9,10
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CN for eye moemenet
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3, 4, 6,
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optic nerver (CN2) cross at andi nnervate
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optic chiasm , innvate "nasal' retina
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eye movement are accomplished through contraction of 6 extraocular eye muscles
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1 superior rectus (CN3)
2 inferior rectus (CN3) 3 medial rectus (CN 3) 4 lateralrectus (CN6) 5 superior oblique (CN4) 6 inferior oblique (CN3) |
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superior oblique muscle
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CN 4 - ipsilateral rotation downward and medial
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lateral rectus muscle
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CN 6 -lateral movement intact
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semiciruclar canal are functinoally pair with
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extraocular eye muscles
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vestibulo-oculomotor reflex
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coordinate head and eye movement to maintain stable image on retina (stabilize gaze during head movement)
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right tuen of head , eye rotate
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left
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RHYTHMIC OSCILLATION OF EYES
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NYSTAGMUS
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SPONTANEOUS NYSTAGMUS WHEN HEAD IS FIXED SIGN OF
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PERIHERALOR CENTRAL PATHOLOGY OR PHAMOCOLOGICAL
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lesion of facial nerve produce(4)
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1 lower eyelid droops
2 corner ofmouth sags 3 diff.to close eyes or expose all teeth on affected side 4 diff control tear and salivation |
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BELL PALSY
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UNILATERAL FACIAL NERVE(cn7)
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lesion of vestinular nerve produce
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vertigo (dizziness) and nystagmus away from side of lesion
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lesion of cochlear nerve (4)
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1 HL
2 tinnitus 3 diff understanding words 4 absentor abnormal acoustic reflexes |
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common sign of lesion of vagus
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absence of gag, vocal hoarseness paralysis of Vocal cord
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