visual paths central pathways Flashcards

1
Q

visual system retina to striate cortex

A

optic nerve to optic chiasm to optic tract to Lateral geniculate body (in thalamus) to optic radiation (lower and upper) to striate area of visual primary cortex

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2
Q

Lateral geniculate nucleus

A

layers are segregated
Magnocellular layer: large cells that recieve input from parasol ganglion cells
Parvo cellular: small cells and receive input from midget cells

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3
Q

retinotopy of primary visual cortex

A

macula densa represents the majority of the striate cortex, mostly burried in the calcarine sulcus

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4
Q

unilateral optic nerve lesion

A

blindness of affected eye only

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5
Q

lesion down the center of the optic chiasm

A

causes bilateral hemianopia

(nasal portions of retina cross over in the optic chiasm and the nasal portion of the retina collects info from the temporal visual fields)

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6
Q

unilateral optic tract lesion

A

causes contralateral homonymous hemianopia

cuts off the lateral retina of the ipsilateral eye- nasal visual field of that eye destroyed
cuts off the nasal retina of the contralateral eye- temporal visual field of that eye

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7
Q

unilateral lesion of optic radiation in anterior temporal lobe (meyers loop)

A

contralateral upper quadrantanopia

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8
Q

unilateral lesion in medial part of optic radiation in parietal lobe (meyers loop)

A

contralateral lower quadrantanopia

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9
Q

occipital lobe lesion

A

homonymous hemianopia with macular/foveal sparing

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10
Q

occipital pole lesion

A

central macular homonymous hemianopia

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11
Q

superior colliculus

A

mesencephalic, recieves input from parosal cells-> controls head and nucleus, orieting stimulus

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12
Q

extrastriate cortex

A

brodmans 17 - striate cortex
Area 4- motor area
V4- color discrimination (achromatopsia) in temporal what is it
V5/MT- detection of motion (snapshot- akinetopsia)in parietal where is it

V1 projects to V2

downstream from V4 is the ventral stream in the temporal lobe and it recognizes faces

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