S3: Visual and Auditory System IDs

Question 1

what does a X in the structure cause?

Answer 1

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.

Question 2

what does damage here cause?

Answer 2

optic chiasm

(note proximity to infundibulum and hypothalamus)

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

Question 3

what does this wrap around?

what does damage here cause?

Answer 3

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.

Question 4

Answer 4

calcarine sulcus

Question 5

light yellow

Answer 5

primary visual cortex

Question 6

Pink area

Answer 6

Primary Visual cortex (V1, area 17)

Question 7

Answer 7

optic tract

Question 8

Answer 8

visual radiation

Question 9

Answer 9

prectum

Question 10

Answer 10

superior colliculis

Question 11

Answer 11

occulomotor

Question 12

Answer 12

occulomotor nerve

Question 13

Answer 13

lateral geniculate n.

Question 14

input is from the?

what is it important for?

Answer 14

Hescl’s gyrus - primary auditory cortex

input - MGN via the posterior internal capsule

important for distuinguishing sound patterns

Question 15

21

input?

output?

Answer 15

MGN

input - inferior colliculus

output - hescl’s gyrus

Question 16

Answer 16

Vestibulo-cochlear Nerve

Question 17

Answer 17

MGN

(can see crus cerebri but not optic tracts yet)

Question 18

what does the lateral lemniscus carry?

Answer 18

from cochlear n. to the inferior colliculus

Question 19

damage to optic nerve – effect on pullairy light reflex

+ light in pislateral eye

Answer 19

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

Question 20

damage to optic nerve – effect on pullairy light reflex

+ light in contralateral eye

Answer 20

Both direct and consensual INTACT

Question 21

damage to occulomotor nerve/EW nucelus

+ light in ipsilateral eye effects

Answer 21

= NO direct, but the consensual is INTACT

Question 22

Damaged oculomotor nerve /EW nucleus

+ light in contralateral eye =

Answer 22

Direct INTACT, NO consensual

Question 23

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

Answer 23

NO direct, NO consensual

Question 24

blue

Answer 24

hescl’s gyri

Question 25

Total Deafness can only be caused by destruction of

Answer 25

BOTH Auditory cortices, MGN or auditory radiations, or BILATERAL damage to the Vestibulocochlear Nerves or Cochlear Nuclei.

Question 26

describe the auditory pathway

Answer 26

Question 27

where is the superior olive?

Answer 27

pons

Question 28

Answer 28

1 – optic nerve

Question 29

Answer 29

2

Question 30

Answer 30

3 – optic chiasm

Question 31

Answer 31

optic tract

Question 32

Answer 32

5

Question 33

Answer 33

Question 34

Answer 34

Question 35

Answer 35