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SP16 Anatomy Exam 3 > L45 Auditory neuro > Flashcards

L45 Auditory neuro Flashcards

1
Q

CNVIII divisions

A

cochlear

vestibular

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2
Q

Vestibule contains two elargements of membranous labyrinth

A

Utricle

Saccule

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3
Q

Perilymph
Fills
Similar to

A

Fills bony labyrinth

SImilar to CSF

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4
Q

Endolymph
FIlls
Similar to

A

Fills membranous labyrinth

Similar to intracellular fluid

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5
Q

Perilymph and endolymph are separated by

A

Tight junctions in hair cells

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6
Q

Tight junctions in hair cells cause

A

voltage and concentration gradients needed for transduction

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7
Q

Perilymph is continuous with ______ thru ______

A

subarachnoid space thru cochlear aqueduct

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8
Q

Endolymph is resorbed in

A

endolymphatic sac

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9
Q

Endolymph is produced by ____ in _____

A

produced by specialized cells in cochlea

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10
Q

Meniere’s disease

A

transient attacks of vertigo, nausea, hearing loss, tinnitus

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11
Q

Obstruction of endolymph causes

A

swelling of membranous labyrinth

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12
Q

Hair cells project into

A

Endolymph

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13
Q

Maculae stimulus

A

linear acceleration

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14
Q

Cristae stimulus

A

angular acceleration

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15
Q

Organ of Corti

A

Sound

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16
Q

Deflection toward tallest stereocilia vs away

A

Toward: depolarization
Away: hyperpolarization

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17
Q

Order of outer and middle ear

A 
Tympanic membrane
Malleus
Incus
Stapes
Perilymph
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18
Q

Blocks the sound of own voice

A

Stapedius pulling stapes away from oval window

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19
Q

Stapedius innervation

A

VII

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20
Q

Blocks chewing sound
Muscle
Bone
Direction

A

Tensor tympani pulling malleus toward middle ear

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21
Q

Tensor tympani innervation

A

V

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22
Q

Scala vestibuli contains

A

perilymph

23
Q

Scala media contains

Other name

A

endolymph

Cochlear duct

24
Q

Scala tympani contains

A

perilymph

25
Q

Cochlea contains

A

Scala vestibuli
Scala media
Scala tympani

26
Q

Modiolus
What is it
Contains

A

Spongy bone at core of cochlea

contains spiral ganglion and cell bodies of primary afferents

27
Q

Organ of corti location

A

Basilar membrane

28
Q

Inner hair cells are stimulated by

A

endolymph movement

Not attached to gelatinous tectorial membrane

29
Q

Outter hair Cells are stiimulated by

A

Vibrations in basilar membrane

Inserted into tectorial membrane

30
Q

Cochlear implant
What is damaged
Where do electrodes go

A

Cochlea hair cells are damaged

Electrods in round window into scala tympani at different points along basilar membrane

31
Q

Primary ascending auditory pathway

Consists of fibers from

A

Lateral lemniscus

Consists of fibers from dorsal cochlear nucleus

32
Q

Primary auditory cortex location

A

Transverse temporal gyri of Heschl

33
Q

Sound Localization

A

Superior Olivary nucleus

34
Q

Superior olivary nucleus receives fibers from
Laterality
location

A

Receives fibers form bilateral cochlear nuclei

Cross midline thru trapezoid body

35
Q

Superior olivary nucleus subnucleus responsible for arrival time comparison

A

Medial

36
Q

Vestibular division role

A

linear and angular acceleration

posture, coordinate eye and head movementh

37
Q

Crista

A

transversely oriented ridge with hair cells

38
Q

Cupula

A

stereocilia in gelatinous mass

39
Q

Utricle
Detects
Macula when head upright
Stereocilia

A

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

40
Q

Saccule
Detects
Macula when head upright
Sterocilia

A

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

41
Q

Otolithic membrane
What is it
Location
Contains

A

Gelantinous membrane of macula

Contains calcium carbonate crystals, otoconia, otoliths

42
Q

Otolithic membrane vs endolymph

A

Denser due to crystals

43
Q

Primary afferent cell bodies

A

Scarpas ganglion in internal auditory canal

44
Q

Scarpas peripheral process

A

synaptic ending on hair cells

45
Q

Scarpas central process

A

vestibular nuclei of rostral medula, caudal pons

46
Q

Vestibular inputs (5)

A 
Semicircular duct
Macula
Cerebellum
Spinal cord
Contralateral vestibular nuclei
47
Q

Lateral vestibulospinal tract
Nucleus
Area

A

Lateral nucleus

Lateral funiculus

48
Q

Lateral vestibulospinal tract
laterality
Travels to
Purpose

A

Ipsilateral antigravity muscles

postural changes to accommodate tilts in body

49
Q

Medial vestibulospinal tract
Nucleus
Area

A

Medial nucleus

extents to cervical cord via MLF

50
Q

Medial vestibulospinal tract

A

Stabilize head movement during walking

Coordinate head and eye movement

51
Q

Vestibuloocular reflex
Afferent
Efferent

A

Afferent: VIII
Efferent: III, IV, VI

52
Q

Vestibuloocular reflex

interneuronal connections

A

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

53
Q

Spin to left

A

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

54
Q

Alcohol

A

Increase alcohol decreases cupula density compared to endolymph

SP16 Anatomy Exam 3 (16 decks)

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