Auditory System Flashcards Preview

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Flashcards in Auditory System Deck (24)
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1

face motor path

precentral gyrus (bilateral)
CBT
LMN in brainstem
target muscles

2

CBT lesions

contra lower face (all other bilateral)

3

cochlea pitches

high pitch at base (close)
low pitch at apex (far)

4

sensorineural hearing loss (conduction)

air > bone

5

conductive hearing loss (conduction)

bone > air

6

conductive hearing loss (examples)

wax buildup
gluing of ossicles
otits media
otosclerosis

7

sensorineural hearing loss (examples)

hair cells damaged
nerves damaged
(VIII)

8

hearing tests

weber
rinne

9

weber test

midline of skull
loss, same ear (conductive)
loss, opp ear (sensorineural)

10

rhine test

AC > BC normal
BC > AC conductive loss

11

cochlear nuc sections

dorsal (freq)
ventral (localization)

12

hearing path

hair cell
cochlear nerve (spiral gang)
cochlear nucleus (ipsi)
thru trapezoid body
sup olivary nuc (bi - pons)
thru lat lemniscus (midbrain)
inferior colliculus (midbrain)
medial geniculate body (thalamus)
sup temporal gyrus (cortex)

13

lesion above cochlear nuc

slight bilateral loss
cant localize sound

14

primary auditory cortex layout

under temporal
low freq, from apex = ant
high freq, from base = post

15

vestibular system fxns

minimize retinal image motion during mvmt
important for spatial orientation
important for posture/equilibrium

16

semicircular duct (mvmt)

angular acceleration

17

atricle/saccule (mvmt)

linear acceleration
gravity

18

vestibulo ocular reflex (VOR)
normal

turn head
endolymph goes opp direction
eyes go opp direction

19

hair cells in VOR

hair cells on side you turn toward: endolymph pushes along axis of hairs, increase firing of VIII
hair cells away from way you turn: endolymph pushes against axis of hairs, decrease firing of VIII

20

VOR path

head turn to side
ipsi vestibular gang fire
ipsi vestibular nuc
contra abducens
a. contra lat rectus
b. ipsi occulomotor thru MLF, ipsi medial rectus

21

nystagmus direction

quick phase away from lesion

22

nystagmus mech

L lesion
R side acts stimulated --> push slowly to L
cortex corrects (put R quickly)

23

lesions --> nystagmus

vestibular nerve or nucleus

24

water in ear

cold (opp): cool in L, stim R, move eyes L slowly, move quickly R

warm: warm in R, stim R, move eyes L slowly, move quickly R