L45 Auditory neuro

Question 1

CNVIII divisions

Answer 1

cochlear

vestibular

Question 2

Vestibule contains two elargements of membranous labyrinth

Answer 2

Utricle

Saccule

Question 3

Perilymph
Fills
Similar to

Answer 3

Fills bony labyrinth

SImilar to CSF

Question 4

Endolymph
FIlls
Similar to

Answer 4

Fills membranous labyrinth

Similar to intracellular fluid

Question 5

Perilymph and endolymph are separated by

Answer 5

Tight junctions in hair cells

Question 6

Tight junctions in hair cells cause

Answer 6

voltage and concentration gradients needed for transduction

Question 7

Perilymph is continuous with ______ thru ______

Answer 7

subarachnoid space thru cochlear aqueduct

Question 8

Endolymph is resorbed in

Answer 8

endolymphatic sac

Question 9

Endolymph is produced by ____ in _____

Answer 9

produced by specialized cells in cochlea

Question 10

Meniere’s disease

Answer 10

transient attacks of vertigo, nausea, hearing loss, tinnitus

Question 11

Obstruction of endolymph causes

Answer 11

swelling of membranous labyrinth

Question 12

Hair cells project into

Answer 12

Endolymph

Question 13

Maculae stimulus

Answer 13

linear acceleration

Question 14

Cristae stimulus

Answer 14

angular acceleration

Question 15

Organ of Corti

Answer 15

Sound

Question 16

Deflection toward tallest stereocilia vs away

Answer 16

Toward: depolarization
Away: hyperpolarization

Question 17

Order of outer and middle ear

Answer 17

Tympanic membrane
Malleus
Incus
Stapes
Perilymph

Question 18

Blocks the sound of own voice

Answer 18

Stapedius pulling stapes away from oval window

Question 19

Stapedius innervation

Answer 19

VII

Question 20

Blocks chewing sound
Muscle
Bone
Direction

Answer 20

Tensor tympani pulling malleus toward middle ear

Question 21

Tensor tympani innervation

Answer 21

V

Question 22

Scala vestibuli contains

Answer 22

perilymph

Question 23

Scala media contains

Other name

Answer 23

endolymph

Cochlear duct

Question 24

Scala tympani contains

Answer 24

perilymph

Question 25

Cochlea contains

Answer 25

Scala vestibuli Scala media Scala tympani

Question 26

Modiolus What is it Contains

Answer 26

Spongy bone at core of cochlea | contains spiral ganglion and cell bodies of primary afferents

Question 27

Organ of corti location

Answer 27

Basilar membrane

Question 28

Inner hair cells are stimulated by

Answer 28

endolymph movement | Not attached to gelatinous tectorial membrane

Question 29

Outter hair Cells are stiimulated by

Answer 29

Vibrations in basilar membrane | Inserted into tectorial membrane

Question 30

Cochlear implant What is damaged Where do electrodes go

Answer 30

Cochlea hair cells are damaged | Electrods in round window into scala tympani at different points along basilar membrane

Question 31

Primary ascending auditory pathway | Consists of fibers from

Answer 31

Lateral lemniscus | Consists of fibers from dorsal cochlear nucleus

Question 32

Primary auditory cortex location

Answer 32

Transverse temporal gyri of Heschl

Question 33

Sound Localization

Answer 33

Superior Olivary nucleus

Question 34

Superior olivary nucleus receives fibers from Laterality location

Answer 34

Receives fibers form bilateral cochlear nuclei | Cross midline thru trapezoid body

Question 35

Superior olivary nucleus subnucleus responsible for arrival time comparison

Answer 35

Medial

Question 36

Vestibular division role

Answer 36

linear and angular acceleration | posture, coordinate eye and head movementh

Question 37

Crista

Answer 37

transversely oriented ridge with hair cells

Question 38

Cupula

Answer 38

stereocilia in gelatinous mass

Question 39

Utricle Detects Macula when head upright Stereocilia

Answer 39

Detects forward-backward and side to side Macula is horizontal when head upright Stereocilia face up

Question 40

Saccule Detects Macula when head upright Sterocilia

Answer 40

Detects forward-backward and up-down Macula is vertical when head upright Stereocilia face laterally

Question 41

Otolithic membrane What is it Location Contains

Answer 41

Gelantinous membrane of macula | Contains calcium carbonate crystals, otoconia, otoliths

Question 42

Otolithic membrane vs endolymph

Answer 42

Denser due to crystals

Question 43

Primary afferent cell bodies

Answer 43

Scarpas ganglion in internal auditory canal

Question 44

Scarpas peripheral process

Answer 44

synaptic ending on hair cells

Question 45

Scarpas central process

Answer 45

vestibular nuclei of rostral medula, caudal pons

Question 46

Vestibular inputs (5)

Answer 46

``` Semicircular duct Macula Cerebellum Spinal cord Contralateral vestibular nuclei ```

Question 47

Lateral vestibulospinal tract Nucleus Area

Answer 47

Lateral nucleus | Lateral funiculus

Question 48

Lateral vestibulospinal tract laterality Travels to Purpose

Answer 48

Ipsilateral antigravity muscles | postural changes to accommodate tilts in body

Question 49

Medial vestibulospinal tract Nucleus Area

Answer 49

Medial nucleus | extents to cervical cord via MLF

Question 50

Medial vestibulospinal tract

Answer 50

Stabilize head movement during walking | Coordinate head and eye movement

Question 51

Vestibuloocular reflex Afferent Efferent

Answer 51

Afferent: VIII Efferent: III, IV, VI

Question 52

Vestibuloocular reflex | interneuronal connections

Answer 52

Vestibular nuclei to MLF to III, IV, VI, and Reticular formation

Question 53

Spin to left

Answer 53

Left semicircular duct excited Right Semiciruclar duct hyperpolarized Right lateral rectus contract, left inhibited Left medial rectus contract, right inhibited Left lateral rectus inhibited

Question 54

Alcohol

Answer 54

Increase alcohol decreases cupula density compared to endolymph