Vestibulocochlear Nerve- II Auditory System

Question 1

Cochlear Division of CN 8

Answer 1

responds to sounds

Question 2

Vestibular Division of CN 8

Answer 2

Responds to position and movement of the head

Question 3

auricle and external auditory canal

Answer 3

Structure and Function External Ear

Question 4

conducts sound to the tympanic membrane.

Answer 4

ext ear

Question 5

medial boundary of the external ear

Answer 5

tympanic membrane

Question 6

Lateral border of middle ear

Answer 6

tympanic membrane

Question 7

Medial border of middle ear

Answer 7

oval & round windows

petrous part of the temporal bone

Question 8

malleus, incus, stapes

Answer 8

Bones of middle ear

Question 9

tensor tympani, stapedius

Answer 9

muscles of middle ear

Question 10

Sound induced ——— of the tympanic membrane are transferred along a chain of 3 small bones (——-) to the —–window

Middle ear

Answer 10

Sound induced vibrations of the tympanic membrane are transferred along a chain of 3 small bones (ossicles) to the oval window

Question 11

attached to tympanic membrane; attached to oval window

Answer 11

malleus vs. stapes

Question 12

types of joints between ossicle bones

Answer 12

synovial joints

Question 13

tf tensor tympani

increases the vibration of tympanic membrane via attachment to the incus(CN -V)

Middle Ear

Answer 13

tensor tympani

decreases the vibration of tympanic membrane via attachment to the malleus (CN -V)

Question 14

Stapedius

increases the vibration of the stapes via attachment to the malleus

Answer 14

Stapedius

decreases the vibration of the stapes via attachment to the stapes

Question 15

protect the ear from excessive vibration

Answer 15

tensor tympani and stapedius

Question 16

area of the tympanic membrane is — greater than the stapes attachment at the oval window.

Answer 16

area of the tympanic membrane is 15x greater than the stapes attachment at the oval window.

Question 17

attached at oval window

Answer 17

stapes

Question 18

differences magnifies the ——- per unit —– of the stapes at the oval window, which is sufficient to move —— within the cochlea.

Answer 18

differences magnifies the force per unit area of the stapes at the oval window, which is sufficient to move perilymph within the cochlea.

Question 19

The perilymph within the cochlea moves from the —- window toward the—-window, in the bony cochlea.

Answer 19

The perilymph within the cochlea moves from the oval window toward the round window, in the bony cochlea.

Question 20

membranous component of the cochlea

Answer 20

auditory receptor cells

deformed by Perilymph movement

Question 21

organ of corti.

Answer 21

auditory receptor cells

cochlea

Question 22

cochlear duct

Answer 22

Membranous Cochlea

Question 23

has endolymph

Answer 23

Membranous Cochlea

Question 24

Filled with perilymph

Answer 24

Bony Cochlea

Question 25

Consists of interconnected bony cavities

Answer 25

Bony Cochlea

Question 26

(high in Na + , low in K + ); (low in Na + , high in K + )

Answer 26

perilymph; endolymph

Question 27

location of the auditory receptor cells … Hair Cells

Answer 27

Membranous Cochlea

Question 28

label the blanks

Answer 28

Question 29

Movement of the stapes deflects the membrane at the oval window

Perilymph movement deforms the membranous cochlea duct which contains the organ of corti with its auditory hair cells

This causes displacement of the perilymph within the bony cochlea

Answer 29

Movement of the stapes deflects the membrane at the oval window

This causes displacement of the perilymph within the bony cochlea

Perilymph movement deforms the membranous cochlea duct which contains the organ of corti with its auditory hair cells

Question 30

scala media

Answer 30

cochlear duct

Question 31

Answer 31

Question 32

tf cochlear duct is square

Answer 32

f

triangular

Question 33

tips of the stereocilia are embedded in the —– membrane (outer hair cells)

Answer 33

tips of the stereocilia are embedded in the tectorial membrane (outer hair cells)

Question 34

Movement of the —— membrane influences movement of the —— and thus, impacts ——- release

Answer 34

Movement of the basilar membrane influences movement of the sterocilia and thus, impacts neurotransmitter (NT) releas

Question 35

release of — will excites CN —–

Answer 35

release of NT will excites CN-VIII

(occurs from basilar membrane when stereocilia is moved )

Question 36

cochlear base

Answer 36

high notes

Stiff

Question 37

cochlear apex

Answer 37

Relatively flexible , low notes

Question 38

“Tonotopically” organized.

Answer 38

Basilar Membrane

Question 39

number of nerve fibers responding

frequency of neuronal firing

Answer 39

Coding of Intensity of the sound

(decibals)

Question 40

location of sound

Answer 40

Coded within the CNS

CNS compares the timing of sounds reaching the two ears

Question 41

Auditory Pathway

Answer 41

majoraity fibers cross to contralateral superior olive

Question 42

cochlear nerve

Answer 42

goes to spiral ganglion and then to cochlear nucleus

Question 43

Superior olive is important in localization of sound

Answer 43

via the timing and intensity of input

Question 44

lat lemiscus

Answer 44

path through which fibers cross to inf colliculus in auditory path

Question 45

Medial Geniculate Nucleus

Answer 45

last nucelus in audiotry pathway before goin to area 41

Question 46

auditory pathway crosings

Answer 46

trapezoid bodies

inferior colliculus,

medial geniculate nucleus

and cerebral cortex

Question 47

The trapezoid body (the ventral acoustic stria) is

Answer 47

part of the auditory pathway where some of the axons coming from the cochlear nucleus(specifically, the anterior cochlear nucleus) decussate (cross over) to the other side before traveling on to the superior olivary nucleus

Question 48

Auditory Cortex

Answer 48

(41/42)

Question 49

antiobiotic

Answer 49

destroy hair cells(ototoxic effects)