Visual Pathways (Lecture #12) Flashcards Preview

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Flashcards in Visual Pathways (Lecture #12) Deck (15):
1

anopsia

no vision

2

hemianopsia

no vision in 1/2 of visual field

3

homonymous hemianopsia

loss of vision in same 1/2 of visual field in both eyes

4

first neuron in the visual pathway; gets stimulated by photoreceptors; lies entirely within retina

bipolar cell

5

second neuron in visual pathway; axons make up optic nerve, chiasm, and tract

ganglion cell

6

where is cell body of third neuron in visual pathway

lateral geniculate nucleus of thalamus

7

what do the axons of the third neuron in the visual pathway form?

optic radiations

8

where does the 4th neuron in the visual pathway lie?

primary visual cortex

9

meyer's loop

axons representing the inferior 1/2 of the retina that swoop down into the temporal lobe

10

superior bank of primary visual cortex represents what part of retina

superior portion of retina

11

inferior bank of primary visual cortex represents what part of retina

inferior portion of retina

12

lesion before optic chiasm will cause

loss of vision in one eye

13

lesion at optic chiasm of decussating neurons will cause

bitemporal visual field loss

14

lesion after the chiasm will cause

contralateral visual field loss in both eyes (homonymous hemianopsia)

15

lesion in Meyer's loop or in inferior bank of the calcarine fissure will cause

homonymous superior quadrantanopsia