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Neurophysiology Test 2 > Vestibular system > Flashcards

Vestibular system Flashcards

1
Q

Movement in a sagittal plane

A

pitch

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2
Q

Movement in the corona plane

A

Roll

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3
Q

Movement in the transverse plane

A

Yaw

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4
Q

The vestibular system is comprised of two major components

A

Otolithic organ

and semicircular system

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5
Q

The otolithic organ can be subdivided into 2 components

A

Utricle

saccule

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6
Q

The semicircular canals can be subdivided into 3 components

A

Horizontal (lateral)
Anterior (Superior)
Posterior

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7
Q

The vestibular system is sensitive two what stimulus

A

Gravitational, and acceleration and deceleration forces

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8
Q

Gravitational and translational forces cause “______ ” of the stereocilia of hair cells within the vestibular organs, to generate proportional changes in their nervous signaling

A

lateral displacements

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9
Q

deflection of the stereocilia towards the tall edge causes the hair cell to _____

A

depolarize

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10
Q

deflection away from the tall edge causes the hair cell to _______

A

hyperpolarize

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11
Q

_____ is responsive to vertical movement

A

Saccule

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12
Q

_____ is responsive to horizontal movement

A

Utricle

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13
Q

What divides the polarity of hair cells

A

Striola

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14
Q

stereocilia from the hair cells extend into a gelatinous sheet, the otolithic membrane
stereocilia from the hair cells extend into a gelatinous sheet, the _______

A

otolithic membrane

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15
Q

The hair cells are bent by movements of an overlying otolithic membrane in response to ____ forces

A

gravitational or inertial

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16
Q

Rotation of the head causes _____ to flow through the semicircular canals

A

endolymph

17
Q

Hair cells in the semicircular canals are housed in what structure?

A

Cupula

18
Q

stereocilia are therefore bent in a direction that is ______ the direction of rotation of the head

A

opposite

19
Q

For each of the ______ semicircular canals, the hair cells in the two canals have opposite polarities

A

paired

Neurophysiology Test 2 (6 decks)

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