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Flashcards in Ear Deck (21)
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1
Q

What are the functions of the ear?

A

collect auditory stimuli
transduce the mechanical stimuli
transmit nerve impulses to CNS

2
Q

What are the three parts of the ear?

A

external
middle
inner

3
Q

What is the pinna?

A

outside of ear

elastic cartilage

4
Q

What are cerminous glands?

A

located within skin of external acoustic canal
apocrine gland
ear wax

5
Q

What is the tympanic membrane?

A

between external and middle ear

poorly vascularized

6
Q

What is tympanic cavity lined by?

A

simple squamous to cuboidal, air filled

7
Q

What are the auditory ossicles?

A

malleus, incus and stapes

8
Q

What is the tensor tympani m.?

A

muscle of malleus

9
Q

T or F: the vibration of sound on the tympanic membrane is transmitted through the middle ear to the cochlea?

A

true

10
Q

What is eustachian tube?

A

communication between middle ear and nasophrayx

air pressure equalization

11
Q

What is the guttural pouch?

A

ventral expansion of the eustachian rube in a horse

can be infected with fungus

12
Q

What are the two parts of the inner ear?

A

bony labyrinth

membranous labyrinth

13
Q

What does the bony labyrinth contain?

A

vestibule
semicircular canals
cochlea

14
Q

What does the membranous labyrinth contain?

A

endolymph
cochlear duct
utricle, saccule
semiciruclar ducts

15
Q

What is the cochlea subdivided into ?

A

scala vestibuli
cochlear duct
scala tympani

16
Q

What is the pathway of sound?

A
outer ear
tympanic membrane
maleus, incus, stapes
vestibular window
scala vestibulli
helicotrema
scala tympani
deflects cochlear duct and stimulates spiral 
stimulates organ of corti
17
Q

What is the organ of corti?

A

hair cells for sterocilla
phalangeal cells for support
pillar cells moved by sound energy

18
Q

What is the vestibular apparatus?

A

organs of equilbrium and motion detection
macula utriculi
macula sacculi
crista ampullaris

19
Q

What is otoliths?

A

gravitational movement of endolymph in saccule and utricle displace these

20
Q

What are semicircular ducts?

A

canals are right angles to one another

angular accleration and deceleration

21
Q

T or F: displacement of cupula of endolymph stimulates hair cells in the crista ampullaris of the semicircular ducts?

A

true