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Neuro Unit 4 > Visual Lesions > Flashcards

Visual Lesions Flashcards

1
Q

Loss of vision is named for

A

vision field lost (NOT retinal)

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2
Q

Scotoma

A

small visual field deficit

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3
Q

Anopsia

A

large visual field deficit

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4
Q

Hemianopsia

A

1 half of visual field lost

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5
Q

Homonymous

A

visual field deficit same in both eyes (L visual field)

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6
Q

Heteronymous

A

visual field deficit in opposite halves (L/R)

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7
Q

Quadrantanopsia

A

deficit in 1/4 of visual field

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8
Q

Agnosia

A

visual association cortex lesion

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9
Q

Optic n. lesion

A

complete blindness in affected eye

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10
Q

Causes for optic nerve lesion

A

trauma or degenerative disease

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11
Q

Optic Chiasm lesion

A

Bitemporal heteronymous hemianopsia (tunnel vision)

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12
Q

Causes for Optic Chiasm lesion

A

pituitary tumor impingement

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13
Q

Early signs of pituitary tumor

A

bitemporal superior quadrantanopsia

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14
Q

Optic tract lesion

A

contralateral homonymous hemianopsia

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15
Q

Lateral optic chiasm lesion

A

ipsilateral nasal hemianopsia

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16
Q

Causes of Lateral optic chiasm lesion

A

internal carotid artery aneurysm (hard to detect due to binocular vision)

17
Q

Optic radiation lesion

A

Contralateral homonymous hemianopsia (loss of ALL fibers on one side fro LGN to visual cortex)

18
Q

Will optic radiation lesion have a pupillary light reflex?

A

YES!

19
Q

Temporal (Meyer’s) Loop Lesion

A

Upper fibers = Contralateral Superior Quadrantanopsia

20
Q

Parietal Portion Lesion

A

Contralateral Inferior Quadrantanopsia

21
Q

Unilateral Lesion to the primary cortex

A

Contralateral homonymous hemianopsia EXCEPT MACULAR SPARING

22
Q

Causes of Unilateral Lesion to the primary cortex

A

occlusion of the posterior cerebral artery or its calcarine branch

23
Q

Why is there macular sparing in Unilateral Lesion to the primary cortex

A

disproportionately large area for fovea and presence of collateral circulation from the MIDDLE CEREBRAL ARTERY

Neuro Unit 4 (12 decks)

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