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neuro lab 1 > Lab 8 - Special senses > Flashcards

Lab 8 - Special senses Flashcards

1
Q

Peri visual info fall on what part of the retina

A

nasal retina

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2
Q

Medial visual field falls on what part of the retina

A

temporal retina

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3
Q

Lower VF pathway

A

upper retina  upper LGN  upper loop  upper visual primary cortex

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4
Q

upper VF pathway

A

lower retina  lower LGN  lower loop  lower visual primary cortex

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5
Q

lesion to the optic nerve

A

losing all of the info for that side (that eye)

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6
Q

lesion to the optic chasm

A

– lose the nasal retinal info, peri vision of both eyes

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7
Q

what is the optic tract carrying

A

all of the visual information for on VF

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8
Q

Left optic tract is carrying what info

A

carrying right visual field

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9
Q

what structure do we go to after the optic tract

A

LGN

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10
Q

two loops from the lGN

A

upper and lower

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11
Q

Lower (Myers) loop goes to what

A

lower visual cortex through the temporal lobe

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12
Q

upper loop goes throught what

A

upper primary visual cortex
Goes through the parietal lobe

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13
Q

when do central and peri vision separate

A

the cortex

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14
Q

Central visual cortex space

A

larger portion of the cortex

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15
Q

Peri vision cortex space

A

smaller portion of the cortex

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16
Q

Central vision sparing

A

Lesion – need to take out a large section of the cortex to take out central vision

this only happens at the level of the visual cortex, this that only place were central and peri are separate

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17
Q

left visual field of our LEFT eye projects onto what part of the retina

A

nasal part of the retina of the left eye

18
Q

bottom of our visual field fall onto what part of the retina

A

top of the retina

19
Q

Optic n lesion

A

Monocular
one eye is knock out

20
Q

Optic chiasm lesion

A

Heteronymous hemianopsia (lesion 2)
‘bitemporal hemianopsia’

Taking out half of the VF for each eye – getting rid of peri vision

21
Q

Optic tract lesion

A

Homonymous hemianopsia (lesion 3)

Loss of the VF (L or R) is lost from bot eyes

22
Q

Optic radiation lesion
upper loop and lower loop

A

Homonymous quadrantnopsia (lesions 4)
parietal lobe – inferior quadrantnopsia

temporal lobe – superior quadrantnopsia (Meyer’s loop)
23
Q

Occipital lobe lesion

A

Homonymous quandrantopsia with central vision spared

24
Q

CN3 eye movements

A

up, down, in
up and in

25
Q

CN4 - trochlear

A

down and in

26
Q

CN6 - abducens

A

lateral eye movement

27
Q

Lesion to CN 3 eye resting position

A

eye positioned more “out and down”

28
Q

Lesion to CN 4 eye resting position

A

eye positioned more “up and out”

29
Q

Lesion to CN 6 eye resting position

A

eye positioned more medially

30
Q

medial longitudinal fasciculus (MLF)

A

‘highway’ for communication from abducens nucleus to contralateral oculomotor nucleus

31
Q

What can elicit conjugate gaze?

A
  1. Voluntary tracking (vision and interest)via cerebral cortex – ‘smooth pursuit’
  2. Head movement: ‘semicircular canals’
  3. Moving object in the visual field: ‘optokinetic reflex’ (finding, tracking)
32
Q

Vestibulo-ocular reflex –

A

efficient and quickly activated by vestibular apparatus; for stabilizing eyes for rapid turning or onset of head motion

*i.e.. turning head side-to-side while reading something

33
Q

optokinetic reflex

A

finding, tracking

Moving object in the visual field

34
Q

optokinetic reflex pathway

A

optic n  optic tract a pretectal nuc medial vestibular nuc contralateral abducens nuc

35
Q

what is faster optokinetic reflex or Vestibulo-ocular reflex

A

optokinetic reflex – slower effect than the vestibule-ocular reflex, but sustains stabilizing objects on the retina for longer duration of head movement; picks up when the vestibular system leaves off

36
Q

dysconjugate gaze

A

two eyes don’t move together

37
Q

dysconjugate gaze caused by a lesion to what

A

lesion of the MLF (dysconjugate but CN6 & CN3 function intact)

lesion of CN6, CN3, or occulomotor nucleus–(how do you differentiate?)

38
Q

issue: Cranial nerve 6 (abducens) – move the eyes left

A

CBT

39
Q

Direct response

A

constriction of the pupil ipsilateral to the pupil exposed to light

40
Q

Consensual response

A

constriction of the pupil contralateral to the pupil exposed to light

41
Q

horners syndrome symptoms

A
  1. persistent pupillary constriction
  2. ptosis of the upper eyelid
  3. loss of sweating on the involved side of face
42
Q

horners syndrome cause

A

lesion of the sympathetic path to the head and neck)-break down of this pathway

neuro lab 1 (7 decks)

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