Visual Pathways (Lecture #12)

Question 1

anopsia

Answer 1

no vision

Question 2

hemianopsia

Answer 2

no vision in 1/2 of visual field

Question 3

homonymous hemianopsia

Answer 3

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

Question 4

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

Answer 4

bipolar cell

Question 5

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

Answer 5

ganglion cell

Question 6

where is cell body of third neuron in visual pathway

Answer 6

lateral geniculate nucleus of thalamus

Question 7

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

Answer 7

optic radiations

Question 8

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

Answer 8

primary visual cortex

Question 9

meyer’s loop

Answer 9

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

Question 10

superior bank of primary visual cortex represents what part of retina

Answer 10

superior portion of retina

Question 11

inferior bank of primary visual cortex represents what part of retina

Answer 11

inferior portion of retina

Question 12

lesion before optic chiasm will cause

Answer 12

loss of vision in one eye

Question 13

lesion at optic chiasm of decussating neurons will cause

Answer 13

bitemporal visual field loss

Question 14

lesion after the chiasm will cause

Answer 14

contralateral visual field loss in both eyes (homonymous hemianopsia)

Question 15

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

Answer 15

homonymous superior quadrantanopsia