S3: Visual and Auditory System IDs Flashcards Preview

Neuroanatomy Lab > S3: Visual and Auditory System IDs > Flashcards

Flashcards in S3: Visual and Auditory System IDs Deck (35)
1

what does a X in the structure cause?

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. 

2

what does damage here cause?

optic chiasm 

 (note proximity to infundibulum and hypothalamus)

 

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

3

what does this wrap around?

 

what does damage here cause? 

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.

4

calcarine sulcus

5

light yellow

primary visual cortex

6

Pink area

Primary Visual cortex (V1, area 17)

7

optic tract

8

visual radiation

9

prectum

10

superior colliculis

11

occulomotor

12

occulomotor nerve

13

lateral geniculate n.

14

input is from the?

what is it important for?

Hescl's gyrus - primary auditory cortex

 

input - MGN via the posterior internal capsule

 

important for distuinguishing sound patterns

15

21

 

input?

output?

MGN 

input - inferior colliculus

output - hescl's gyrus

16

Vestibulo-cochlear Nerve

17

MGN

(can see crus cerebri but not optic tracts yet)

18

what does the lateral lemniscus carry?

from cochlear n. to the inferior colliculus

19

damage to optic nerve -- effect on pullairy light reflex 

+ light in pislateral eye

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

20

damage to optic nerve -- effect on pullairy light reflex

+ light in contralateral eye

Both direct and consensual INTACT

21

damage to occulomotor nerve/EW nucelus 

+ light in ipsilateral eye effects

= NO direct, but the consensual is INTACT

22

Damaged oculomotor nerve /EW nucleus

+ light in contralateral eye =

 

Direct INTACT, NO consensual

23

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

 

NO direct, NO consensual

24

blue

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

33

34

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