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20 Cards in this Set

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