auditory and vestibular anatomy Flashcards Preview

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Flashcards in auditory and vestibular anatomy Deck (40):
1

auditory symptoms: lesion to cochlear nerve (aside from tinnitus)

- unilateral hearing loss
- facial weakness
- vestibular disorder

2

auditory symptoms: lesion to cochlea (aside from tinnitus)

- hearing loss
- hyperacusis
- aural fullness

3

auditory symptoms: middle ear lesion (aside from tinnitus)

- hearing loss

4

auditory symptoms: lesion to cerebellopontine angle (aside from tinnitus)

- unilateral hearing loss
- poor word discrimination
- vestibular disorder
- facial weakness
- facial numbness

5

Three signs/symptoms of vestibular lesion

- quick spins
- vertigo
- ataxia

6

two brainstem neurons for auditory system

- cochlear nuclei
- superior olivary nuclei

7

___ is connected to the oval window

scala vestibuli

8

photoreceptors are to the eye as ___ are to the ear

inner hair cells: primary sound TRANSDUCTION

9

olivocochlear bundle

affects the outer hair cells for the MODULATION of sound

10

basilar membrane changes in __ and __ from the apex to the base. which part is for high pitches?

it changes in thickness and stiffness; the stiff part is for high pitches

11

can you regenerate hair cells?

NO

12

does he care about type I vs type II hair cells? medial vs lateral olivocochelar?

NO. just call them hair and olivocochlear

13

endolymph is made by __ important for?

striavascularis; it has ion pumps for manipulating the ions in perilymph/endolymph

14

when hairs bend toward the kinocilium what happens?

depolarize

15

pathway for cell bodies of auditory system
KNOW THIS!!

1= spiral ganglion and send to brain and bifurcate to
2= dorsal cochlear nucleus and and ventral cochelar
3= superior olive (some cross to other side via trapezoid body)
4= inferior colliculus to brachium
5= mgn
6= auditory cortex (heschels area 41)

16

first place that you get info from both ears

superior olive

17

where else does auditory info go

reticular formation for the auditory startle reflex
CN8 ==> CN 5, CN 7 (stapedial reflex)
amygdala (for emotions)

18

cochlear nerve cells go to

both dorsal and ventral cochlear nuclei

19

lateral lemniscus

connection of auditory pathways from superior olive to inferior colliculus

20

superior olivary complex

RIGHT NEXT TO FACIAL MOTOR NUCLEUS

21

where do you compare R and L sound?

begins in SUPERIOR OLIVE. Remember this is the first location for BIAURALinfo. it compares which sound ARRIVES first, and which one is LOUDER; this tells you where the sound is coming from

22

middle ear reflex

related to both tensor tympani and facial motor nucleus

23

turning your head toward sound ... what parts do you need

inferior colliculss
MGN
area 42
tectospinal tract

24

rinne test

tuning fork on mastoid prcess, because of bone conduction, sound goes to CNVIII; when you can't hear the bone, they move it in front of the ear to see if you can still hear it. (AIR conduction)
tests for conduction hearing loss

25

weber test

you put tuning fork on midline of skull; which side is louder? the ear that hears it louder is plugged
localizes sound to the BAD ear if it is conductive deafness
localizes to GOOD ear if its a nerve damage

26

lean with it, rock with it. if you lean to the right you....

stimulate right utricle, right leg stiffens (via medial and lateral vestibulopinal tract) and pushes back toward center

27

location of otoconia in BPPV

utricle

28

loss of function in right utricle

lean to the right. (I would like to call this the "lean with it rock with it" syndrome)

29

vestibulo-occular reflex (VOR)? which CNS

the ballerina reflex so that you can "foveate" and fix gaze while you spin
CN III, VI, VIII

30

lateral vestibular nucleus is

IPSILATERAL and LONGER; goes to cbellum, limb motor neurons

31

medial vestibular nucleus

vestibulocolic reflex: if you fall on sidewalk, then you pull your head back so you don't hit it on the sidewalk; this nucleus is BILATERAL

32

medial and lateral vestibulospinal tract

affect the axial muscles

33

VOR pathway

Ms. Scarpa is a MiLF. She likes 3, 4, or 6 things to go in her vestibular complex
- scarpa ganglion (aka vestibular ganglion)
- vestibular nuclear complex
- MLF
- CN 3, 4, 6

34

vestibulo-thalamo-cortical path

vestibular nuclei
VPL,
area 3a and posterior insula

35

vestibular system gets input from?

hair cells, cBellum

36

location of plantum temporale

posterior to heschel's gyrus

37

remember "COWS"

Cold Opposite; Warm Same
always named by the FAST component of nystagmus

38

what is the endolymphatic aqueduct

its a little connection between the utricle, saccule, endolymphatic sac; we aren't really sure what the function is... its a tube that dead ends at the dura.

39

where does blood to inner ear drain?

the veins follow the course of the artery (labyrinthine) then it collects in the superior petrosal sinus

40

what happens at the modiolus?

this is the point where the cochlear canal turns around and comes back toward the round window.