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Organ Systems III > Vestibular System > Flashcards

Vestibular System Flashcards

1
Q

Endolymph is secreted by

A

Cochlear duct

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2
Q

Endolymphatic duct drains into

A

Dural sinus

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3
Q

Perilymph drains from _______ and _________

A

Capillaries and CSF

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4
Q

Perilymphatic duct drains into the

A

Subarachnoid space, into the dura, and into the CSF

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5
Q

Different regions of the membranous labyrinth

A

Semicircular canals, utricles, saccules

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6
Q

Different regions of the membranous labyrinth

A

Semicircular canals, utricles, saccules

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7
Q

Cupula is epithlium of sterocilia that project into

A

Gelatinous mass

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8
Q

Crista is sensitive to motion of

A

Endolymph

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9
Q

Crista is sensitive to this acceleration

A

Angular acceleration

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10
Q

Macula of saccule and utricle are this

A

Cilia that project into gelatinous matrix. Contain otoliths (calcium carbonate stones)

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11
Q

Movement of otoliths occur due to

A

Linear acceleration without endolymphati movement

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12
Q

Movement of otoliths occur due to

A

Linear acceleration without endolymphati movement

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13
Q

Macula detects movement in this plane;

Utricles detects movement in this plane

A

vertical;

horizontal

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14
Q

Vertigo is caused by this

A

acoustic neuroma, meniere’s disease, benign paroxysmal positional vertigo–
Loss of equilibrium

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15
Q

Vertigo is caused by this

A

acoustic neuroma, meniere’s disease, benign paroxysmal positional vertigo–
Loss of equilibrium

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16
Q

Meniere’s Disease is caused by

A

Escess secretion and decreased drainage of endolymph- the labyrinth becomes dialated. Epithelia and receptor cells get stretched

17
Q

Symptoms of Meniere’s Disease

A

Sensorineural hearing loss, tinnitus, vertigo, fullness in the ear

18
Q

Benign Paroxysmal Positional Vertigo (BPPV) is caused by

A

Otoliths from the utricle that all into semicircular canals

19
Q

Conflict of these senses occurs in BPPV

A

Sensory input between dysfunctional vestiblar and normal somatosensory;
Visual and proprioception senses produce shift in position and body motion

20
Q

VEstibuar nerve donducts vestibular activity to

A

Vestibular nuclei in brain stem (posture, eye movements); vestibulo-cerebellum (vestibular reflexes)

21
Q

Dysfunction of vestibular system will not communicate correctly with

A

The brainstem

22
Q

Dysfunction of vestibular system will not communicate correctly with

A

The brainstem

23
Q

Vestibulo-Ocular Reflex does this

A

Adjusts eye movements to rotation of head to fix gaze on a visual object

24
Q

Nerves in vestibulo-ocular reflex

A

Abducens VI - horizontal semicircular ducts- turns head to the left;
Oculomotor nuclei III - turns eye to the right

25
Q

Nystagmus is this

A

Involuntary saccadic movement when the eyeball is moving

26
Q

Pahotological vs physiological nystagmus

A

Physiological- norma part of scanning; pathological- eyes are still flicking unnecessarily. Problem in semicircular canals, utricle, saccule, or vestibulo-cerebellum

27
Q

Posture is a pathway that descends from

A

Vestibular nuclei of the brain

28
Q

This provides precision for posture control

A

Cerebellum

29
Q

Vestibulo-sympathic reflex enhances this vascular action

A

Enhances vasoconstriction- to protect against synocpe during postural changes or emotional stress

30
Q

To increase MAP due to postural changes, this occurs

A

increased otolithic activity enhances sympathetic activity to blood vessels in skeletal muscles and kidney

31
Q

Sacroutrical regions detect this movement when you stand up

A

Vertical movement- they act to control sympathetic activity– vestibular system works with baroreceptor system

32
Q

Vestibulo-sympathetic reflex increases this during nausea

A

vasoconstriction and sweating

33
Q

Vestibular nuclei controls

A

RVLM

34
Q

In addition to skeletal muscle, this organ is affected by the vestibulo-sympathetic reflex

A

Kidney- very reactive to changes in blood flow

35
Q

Vestibulo-parasympathetic reflex acts to do this with blood flow

A

Restores cerebral blood flow after BP drop (orthostatic hypotension)

  • MAP: baroreceptor vasoconstriction
  • Cerebral blood flow: vasodilation of cerebral vessels
36
Q

Vestibulo-parasympathetic reflex is activated in this pathway

A

Solitary nucleus, pterygopalatine (parasympathetic) ganglion–>vasodilation

37
Q

Visual, tactile, and vestibular input allow for this

A

First-person perspective

Organ Systems III (10 decks)

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