Neuro- ear anatomy & auditory system Flashcards Preview

Neuroanatomy final exam > Neuro- ear anatomy & auditory system > Flashcards

Flashcards in Neuro- ear anatomy & auditory system Deck (62):
1

what are the structures of the external ear?

1) Pinna
2) external auditory canal
3) tympanic membrane

2

the middle ear consists of the Tympanic membrane, and the middle ear cavity which holds the ______

ossicles

3

name the ossicles

Malleus
incus
stapes

4

the tensor tympani muscle attaches to which ossicle?

Malleus

5

what nerve innervates the tensor tympani muscle?

CN 5 (trigeminal)

6

which muscle attaches to the stapes?

stapedius muscle

7

the stapedius muscle is innervated by what?

CN 7 (facial nerve)

8

the inner ear consists of 2 ______

labyrinths

9

which inner ear labyrinth is located in the temporal bone?

osseous labyrinth

10

the membranous labyrinth contains ___________ of the ear

neuroepithelium

11

the cochlear duct and organ of corti are located where?

in the membranous labyrinth

12

the vestibular labyrinth is involved with sensing ______

balance

13

the osseous labyrinth is found in the ______ portion of the temporal bone

petrous

14

the osseous labyrinth is filled with what fluid?

perilymph

15

the membranous labyrinth consists of ducts and chambers filled with ______

endolymph

16

the membranous labyrinth contains the sensory ______ of the inner ear

neuroepithelium

17

the membranous portion of the cochlear division of the inner ear consists of the ____ ____

scala media

18

what is another name for the scala media?

cochlear duct

19

what are the 3 ducts of the cochlea?

1) Scala media (cochlear duct)
2) Scala tympani
3) Scala vestibuli

20

the scala media is part of the _______ labyrinth

membranous

21

the scala vestibule is part of the ______ labyrinth

osseous (bony) labyrinth

22

the Footplate of the stapes is the ________

oval window

23

the scala ____ is filled with endolymph

scala media

24

which structures are filled with perilymph?

1) Scala Vestibuli
2) Scala Tympani

25

the auditory duct starts at the oval window and ends at the ______ window

round

26

the organ of corti is also known as what?

the spiral organ

27

what separates the scala vestibuli from the scala media?

Vestibular (reissner's) membrane

28

the scala media is bounded by the vestibular and basilar membranes. this cavity is filled with ______

endolymph

29

where is the organ of corti found?

inside the scala media

30

what structure lies directly above the hair cells in the organ of corti?

tectorial membrane

31

hair cells of the organ of corti are in contact with ___________ nerves

statoacoustic nerves

32

which cranial nerve projects statoacoustic nerves into the organ of corti?

CN 8

33

the basilar membrane separates which 2 cochlear chambers?

scala tympani from the scala scala media

34

what are the 2 auditory streams

the "what" and the "where"

35

the "what" auditory stream is involved with what form of processing?

language processing

36

which cochlear nucleus is involved with the "what" auditory system?

dorsal cochlear nucleus

37

the "where" auditory stream is involved with what aspect of sound stimuli

location of sound

38

the "where" auditory stream is involved with which cochlear nucleus?

ventral cochlear nucleus

39

which nuclei are involved with the flow of information from the ventral cochlear nucleus?

1) superior olivary nucleus
2) nucleus of the lateral lemniscus

40

most of the output neurons from the ventral cochlear nucleus project to where?

superior olivary nucleus

41

the superior olivary complex is involved with sound ______

location

42

what factors allow the superior olivary complex to detect sound location?

1) time delay between ears
2) intensity differences of sound

43

the superior olivary complex uses the ________ system

olivocochlear system

44

what is the termination of the olivocochlear system?

outer hair cells of cochlea

45

the olivocochlear system's function is to:

A) protect from loud sounds
B) suppress constant background noise

plays a role in postnatal hearing development

46

from the spiral ganglion and statoacoustic nerves (of CN 8), the nerves travel where?

to the cochlear nuclei

47

what type of nerve fibers exit the cochlear nuclei?

crossing, second order, auditory fibers

48

fibers from the cochlear nuclei ascend ______ and ______

ipsilateral and contralateral

49

fibers of the cochlear nuclei travel through the __________ to reach the inferior colliculus

Lateral lemniscus

50

after passing through the lateral lemniscus, where do nerve fibers terminate?

the inferior colliculus

51

nerve fibers from the inferior colliculus travel where?

A) medial geniculate body

(then to the primary auditory cortex)

52

Where is the medial geniculate body found?

the thalamus

53

the "what" auditory stream projects from the primary temporal gyrus in a ventral direction to where?

superior and middle temporal gyri

(language processing)

54

the "where" auditory stream projects dorsally to what part of the cortex?

superior parietal lobule

**plans motor response to stimuli location

55

nerve fibers traveling from the inferior colliculus to the superior colliculus are responsible for what? which auditory stream are they from?

from the "where" auditory stream

give reflex response to sound stimuli

56

what areas of the temporal lobe are involved with "what" auditory processing?

superior & middle temporal gyrus

57

what specific gyrus contains the primary auditory gyrus?

Helschl's gyrus

(Brodmann's area 41)

58

where in the cortex does word processing occur?

Anterior Superior temporal gyrus

59

where does sentence processing occur in the cortex?

Posterior Superior temporal gyrus

60

which gyrus of the cortex is responsible for planning motor function based on sound?

superior parietal lobule

61

which structure is responsible for generating reflexes based on sound?

superior colliculus

62

the superior olivary complex is responsible for what 2 functions?

1) sound location
2) olivocochlear system (protect ear from loud noises)