S3: Visual and Auditory System IDs Flashcards

1
Q

what does a X in the structure cause?

A

optic nerve

A lesion of the right optic nerve causes

  1. a total loss of vision in the right eye
  2. it also producesa right afferent pupil deficit.
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2
Q

what does damage here cause?

A

optic chiasm

(note proximity to infundibulum and hypothalamus)

X - loss of vision in the temporal half of both visual fields:
bitemporal hemianopsia3

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3
Q

what does this wrap around?

what does damage here cause?

A

optic tract

thalamus and the crus cerebri

A lesion of the right optic tract causes a complete loss of vision in the left hemifield:
contralateral “homonymous” hemianopsia.

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4
Q
A

calcarine sulcus

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5
Q

light yellow

A

primary visual cortex

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6
Q

Pink area

A

Primary Visual cortex (V1, area 17)

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7
Q
A

optic tract

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8
Q
A

visual radiation

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9
Q
A

prectum

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10
Q
A

superior colliculis

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11
Q
A

occulomotor

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12
Q
A

occulomotor nerve

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13
Q
A

lateral geniculate n.

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14
Q

input is from the?

what is it important for?

A

Hescl’s gyrus - primary auditory cortex

input - MGN via the posterior internal capsule

important for distuinguishing sound patterns

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15
Q

21

input?

output?

A

MGN

input - inferior colliculus

output - hescl’s gyrus

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16
Q
A

Vestibulo-cochlear Nerve

17
Q
A

MGN

(can see crus cerebri but not optic tracts yet)

18
Q

what does the lateral lemniscus carry?

A

from cochlear n. to the inferior colliculus

19
Q

damage to optic nerve – effect on pullairy light reflex

+ light in pislateral eye

A

Damaged optic nerve – light in ipsilateral eye =
NO direct, NO consensual

20
Q

damage to optic nerve – effect on pullairy light reflex

+ light in contralateral eye

A

Both direct and consensual INTACT

21
Q

damage to occulomotor nerve/EW nucelus

+ light in ipsilateral eye effects

A

= NO direct, but the consensual is INTACT

22
Q

Damaged oculomotor nerve /EW nucleus

+ light in contralateral eye =

A

Direct INTACT, NO consensual

23
Q

Damage to medial midbrain (ie. Bilateral Pretectal nuclei and/or both EW nuclei)

A

NO direct, NO consensual

24
Q

blue

A

hescl’s gyri

25
Total Deafness can only be caused by destruction of
BOTH Auditory cortices, MGN or auditory radiations, or BILATERAL damage to the Vestibulocochlear Nerves or Cochlear Nuclei.
26
describe the auditory pathway
27
where is the superior olive?
pons
28
1 -- optic nerve
29
2
30
3 -- optic chiasm
31
optic tract
32
5
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34
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