Quiz 10 - Ear Flashcards Preview

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Flashcards in Quiz 10 - Ear Deck (31):
1

oval window

filled by base of stapes; hole that connects to inner ear

2

round window

inferior to oval window; flexible membrane separating perilymph (fluid) in cochlea from middle ear

3

tensor tympani and stapedius

skeletal muscles that dampen large vibrations to prevent damage in cochlea

4

middle ear

auditory tube
auditory ossicles
oval window
round window
tensor tympani and stapedius

5

inner ear

bony labyrinth
membranous labyrinth

6

bony labyrinth

shell of defense bone that surrounds and protects the membranous labyrinth

7

membranous labyrinth

collection of fluid-filled tubes and chambers
- perilymph
- endolymph

8

perilymph

fills membranous labyrinth

9

endolymph

surrounds membranous labyrinth

10

vestibular system

maintains our orientation and balance in space (equilibrium)

11

vestibular apparatus

filled with endolymph consisting of:
- utricle and saccule
- semicircular canals

12

semicircular canals

analyzes rotational movement in 3 planes
- lateral (shaking head "no" - horizontal plane)
- anterior (shaking head "yes" - vertical plane)
- posterior (tilting head from side to side - lateral plane)

13

ampulla

contains cupola and hair cell receptors that responds to rotational movement

14

cupula

gel-like structure where hair cells are embedded

15

hair cells (mechanoreceptors)

receptors for detecting equilibrium

16

kinocilium and sterocilia

hair-like extensions contained in hair cells (when bent, hair cells depolarize and release neurotransmitters that stimulate nerve)

17

detection of linear acceleration

macula and otolith

18

macula

contain hair cell receptors to detect linear acceleration; located in utricle and saccule

19

otolith

jelly-like mass with tiny calcium carbonate crystals were hair cells are embedded

20

utricle

macula sensitive to horizontal acceleration (car)

21

saccule

macula sensitive to vertical acceleration (elevator)

22

coclea

"snail" - spiral shaped bony chamber containing cochlear duct (containing mechanoreceptors for hearing)

23

cochlear duct

lies between 3 perilymph-filled chambers: houses organ of Corti

24

vestibular duct

(filled w/ perilymph): form oval window (base) to tip of spiral (apex); superior to cochlear duct

25

vestibular membrane

forms "roof" of cochlear duct

26

tympanic duct

(filled w/ perilymph): from tip of spiral (apex) to round window, inferior to cochlear duct

27

organ of corti

contains hair cell receptors that rests on basilar membrane of cochlear duct

28

tectorial hembrane

lie on top of hair cells

29

organ of corti

contains hair receptors that rests on basilar membrane of cochlear duct

30

tectorial membane

lie on top of hair cells (forms "tent")

31

sterocilia and kinocilium

bending cilia mechanically gated ion channels (mechanoreceptors), causing depolarization and releasing neurotransmitters, leading to cochlear fibers to fire action potential