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lab 8: visual , auditory and vestibualr systems Flashcards

(56 cards)

1
Q

what is the function and innervation of the superior rectus

A

elevate the eyes , causes cornea to move superiorly
CN3

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2
Q

what is the function and innervation for the inferior rectus

A

depresses the eyes , causes the cornea and the pupil to move inferiorly
CN 3

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3
Q

what is the function and innervation of the medial rectus

A

adduction of the eye
CN 3

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4
Q

what is the function and innervation of the laterla rectus

A

moves eye laterally and CN 6

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5
Q

what is the function and innervation of the superior oblique

A

rotates the eyes downward and away from midline
CN 4

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6
Q

what is the function of the inferior oblique

A

elevation , abduction and extorsion of the eye

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7
Q

what would happen if CN 3, 4 , and 6 has lesion

A

paralysis of the eye

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8
Q

where is the optic nerve

A

from eyeball to optic chiasm

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9
Q

where is the optic tract

A

after chiasm to nucleus

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10
Q

what is the function of the optic chiasm

A

allows the visual cortex to receive the same hemispheric visual field from both eyes

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11
Q

what is the function of the hypothalamus related to vision

A

controls sympathetic nervous system ( pupil dilation) and parasympathetic nervous system (pupil constriction)

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12
Q

what is the function of the thalamus related to vision

A

the lateral geniculate nucleus plays an essential role in normal visual processing

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13
Q

what is the function of the superior colliculus

A

integrates visual , auditory and somatosensory information to initiate orienting movements of eyes and head toward objects

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14
Q

what is the function of the pretectum

A

controls pupillary light reflex

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15
Q

what is the function for the primary visual cortex

A

receives visual information from retinas

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16
Q

what is the function of the calcarine fissure

A

divides the upper and lower visual fields

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17
Q

what is the function of the cuneus (upper bank)

A

receives visual info from the lower eyes fields

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18
Q

what is the function of the lingual

A

receives information from the superior eye fields

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19
Q

what is the function of the parieto-occipital sulcus

A

provides a landmark for defining the location of the primary visual cortex

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20
Q

what’s is the function of the CN 3

A

movement of eyeball
pupillary contraction and accommodation

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21
Q

what is the function of CN 4

A

rotates the eyes downward and way from midline

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22
Q

what is the function of CN 6

A

moves the eye laterally

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23
Q

what is the function of the frontal eye field of cortex

A

control visual attention and eye movements
elicits saccadic eye movemtsn

24
Q

how does vision get received from the eye and travel to the cortex

A

retina > optic nerve > optic chiasm> optic tract> lateral geniculate nucleus of thalamus > optic radiations > visual cortex

25
what would a lesion to the optic nerve causes
blindness in ipsilateral eye
26
what would a lesion to the optic tract causes
homonymous hemianopsia
27
what would a lesion to the optic chiasm causes
bitemporal hemianopsia
28
what would a lesion to the meyers loop causes
a contralateral homonymous superior quadrantanopia
29
what would a lesion to the visual cortex cause
homonymous hemianopsia and scotomas with bilateral lesions causing cortical blindness
30
describe homonymous hemianospia and how it will impact treatments
same halves of the visual field from each eye is lost, you will need to make sure the patient turns their head and body to compensate for the loss of vison
31
describe neglect and how it will impact treatments
unawareness or unresponsiveness to objects , people and other stimuli. patient will have to turn their head and body a lot to see the affected side
32
what is the function of CN 8
hearing and balance
33
what is the function of the superior olive
sound localization
34
what is the function of the nucleus of the lateral lemniscus
carries information about sound from the choclear nucleus to brainstem and ultimately the contralateral inferior colliculus of the midbrain
35
what is the funciotn of the reticular formation for the auditory system
effect of sound on CNS
36
what is the function of the inferior colliculus for the auditory system
serves as the main brainstem nuclei for auditory function
37
what is the function of the medial geniculate body of the thalamus
directs auditory attention
38
what is the function of the primary auditory cortex and how is it organized
organized tonotopically, supporting basic auditory functions
39
what is the function of the secondary auditory cortex
compares sounds with memories of sounds to categorize them
40
what is the function of the internal acoustic meatus
allows the passes of CN 7 , 8 and labyrinthine artery
41
describe how sounds get receives from the ear and travels to the cortex
sound waves come into the ear and vibrate the fluid in the cochlea which stimulates hair cells , the hair cells depolarize and send signals to the cochlear nucleus > superior olive > infeiro colliculus > medial geniculate > primary auditory cortex
42
what is the function of the anterior semicircular canal with ampullae
detects forward and back head movements
43
what is the function of the posterior semicircular canal
detects head tilt like tipping the head toward the shoulders
44
what is the function of the horizontal semicircular canal
detects horizontal movements of the head , like swiveling side to side
45
what is the function of the utricle
orientation and static balance , horizontal tilt
46
what is the function of the saccule
orientation and balance , vertical tilt
47
what is the function of the CN 8 in the vestibular system
provides info about one’s body in space and time
48
what is the function of the medial longitudinal fasciculus in the vestibular system
integrates movements of the eyes and heads to keep balance
49
what is the function of the vestibulocerebellum
controls balance and eye movements
50
what is the function of the medial vestibulospinal tract
performs synchronization of the movements of the eyes with the movements of the head
51
what is the function of the lateral vestibulospinal tract
coordinates orientation of the head and body in space
52
what is teh function of the reticulospinal tract in the vestibular system
controls posture to help orient head
53
what is the function of the vestibular cortex
interacts with visual cortex to mediate self perception and balance
54
what is the function of the parietoinsular vestibular cortex
core region of vestibular input into the cortical region , integrates and processes sensory inputs
55
what is the function of CN 11 in the vestibular system
helps move the head to keep it oriented
56
describe how information gets received from the vestibular apparatus and travels to the cortex . differentiate between peripheral and central systems
the peripheral vestibular systems goes all the way from the labyrinth to the connections of the peripheral nerve into the vestibular nuclei the central vestibular systems includes the central vestibular nuclei in the brain stem , the vestibular cerebellar connection , the vestibular ocular pathways and the vestibular spinal pathways