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13 Cards in this Set
- Front
- Back
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Describe the pathway of the visual system
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Eye-> Optic nerve -> optic chiasm -> optic tract -> LGN -> optic radiations to primary visual cortex (and superior colliculus & pretectal areas)
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Lesion in the optic chiasm
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Bitemporal hemianopia
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Lesion of the optic nerve
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Monocular visual field defects
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Where is the optic chiasm located?
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Beneath the frontal lobes, just in front of pituitary gland
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Where are the optic tracts located?
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Wrap around the midbrain laterally to reach the lateral geniculate nucleus (LGN) of the thalamus
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Lesions on optic radiations cause
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Homonymous defects affecting the contralateral visual field
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What is Meyer's loop?
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Inferior optic radiations in the temporal lobe, carrying information from superior visual field.
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Temporal lobe lesions can cause what kind of visual defect?
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Homonymous superior quadratanosia
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Parietal lobe lesions can cause what kind of visual field defect?
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Contralateral homonymous inferior quadratanopia
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The fissure in what the primary visual cortex borders
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Calcarine fissue
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Dorsal visual pathways do what?
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"Where?" by anaylzing motion and spatial relationships between objects, body, and visual stimuli
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Ventral pathways visual do what?
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"What?" Process colors, faces, letters, form, etc.
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What is a scotoma?
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Partial area of diminished vision, may be a spoke surrounded by normal vision, or a ring of diminished vision in the periphery
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