Ear & Auditory Tube Flashcards Preview

Jason's Neuro Block > Ear & Auditory Tube > Flashcards

Flashcards in Ear & Auditory Tube Deck (31):
1

Lateral 1/3 is?
Medial 2/3 is?

1. cartilagenous
2. bony

2

external accoustic meatus contains what?

hairy skin and Cerumen glands: prevent maceration with water

3

What 2 nerves innervate the ear?

Vagus
V3 auriculotemporal nerve

4

V3 auriculotemporal nerve innervates what in the ear?

anteriosuperior
external surface of tympanic membrane

5

Vagus innervates what in the ear?

posterioinferior inner ear

6

what's the implication of V3 auriculotemporal nerve?

since part of trigeminal nerve, can have reerred pain from other areas like tooth to ear etc.

7

what's the imprint on the tympanic membrane lateral surface?

handle of malleus

8

what shape is the tympanic membrane ?

concave externally
convex internally

9

why is the cone of light in the tympanic membrane important where should it be?

Antero-Inferior
shows the concavity, clinical sign

10

2 areas of middle ear are?

1. epitympanic recess (to mastoid air cells)
2. tympanic cavity proper

11

what's bad about infections in the middle ear?

can get into epitympanic recess, hard to drain, get into mastoid air cells. cause problems

12

differences in infant and adult Eustachian tube?

infant more horizontal = less drainage = more otitis media

13

cleft palate more likely to cause?

more eustuchian tube problems/otitis media

14

which ossicles is attached to tympanic membrane?

handle of malleus

15

which ossicle is attached to oval window?

stapes

16

what two muscles dampen sound? innervations?

Stapedius: Seventh nerve (Facial)
Tensor Tympani: Trigeminal (trigeminal)

17

what conditions don't allow dampening of sound, why?

acoustic neuromas that compress trigeminal/facial nerve palsies

18

Chorda tympani part of?

facial nerve

19

what is the promontory?

basal turn of the cochlea

20

facial nerve emerges where?

stylomastoid foramen

21

what vital vessel is close to middle ear?

internal carotid

22

what are the two labyrinths in the inner ear what fluid do they contain?

Bony Labyrinth: perilymph
Membranous labyrinth: endolymph

23

bony labyrinth is located?

petrous part of temporal bone

24

what contains the sensory receptros for hearing?

cochlear duct

25

what senses static equilibrium?

utricle
saccule

26

what senses dynamic equilibrium?

ampulla of the semicircular ducts

27

utricle
saccule senses what?

static equilibrium

28

ampulla of the semicircular ducts senses?

dynamic equilibrium

29

where in the cochlea are high and low frequencies detected?

High Freq: base
Low Freq: apex of cochlea

30

Saccule is vertical or horizontal?

Vertical

31

Utricle more vertical or horizontal?

Horizontal