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27 Cards in this Set
- Front
- Back
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Which CN are concerned with visual function?
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CN II-VII
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What cranial nerve is involved in lid closure and tears?
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CN VII
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What CN is involved with the corneal reflex
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CN V
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What is bilateral swelling of the optic discs called?
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Papilledema
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Splinter hemorrhages are a sign of what visual condition?
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Papilledema
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What are 5 characteristics of papilledema?
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1. Bilateral disc edema
2. Absent venous pulsations 3. Splinter hemorrhages 4. Exudates/cotton-wool spots 5. Haziness of the retinal vessels at disc margins |
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Which retinal receptor is concerned with visual acuity?
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Cones
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Which retinal receptor is concerned with central vision?
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Cones
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Which retinal receptor is concerned with bright light?
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Cones
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Which retinal receptor has a small receptive field?
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Cones
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Which retinal receptor is concerned with visual field?
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Rods
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Which retinal receptor is concerned with peripheral vison?
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Rods
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Which retinal receptor is concerned with movement?
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Rods
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Which retinal receptor has a large receptive field?
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Rods
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Which retinal receptor has large convergence onto bipolar cells?
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Rods
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The axons of these cells make up optic nerves, tracts, and chiasm
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Ganglion cells
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Where does the optic nerve leave the eye?
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At the optic disc (blind spot)
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What results from a lesion of the optic nerve?
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Ipsilateral blindness or field defect and optic atrophy
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Which retinal fibers are crossed?
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Nasal
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Which retinal fibers are uncrossed?
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Temporal
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A lesion of the optic chiasm results what type of vision defect?
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Bitemporal
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Optic nerve fibers synapse where?
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In Lateral Geniculate Nucleus---NOT IN THE VISUAL CORTEX!!!
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Lesion of the optic tract results in:
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Contralateral homonymous hemianopia
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Ventral layers of the lateral geniculate nucleus are called: _____ layers
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Magocellular layers (layers 1&2 of the LGN)
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Dorsal layers of the lateral geniculate nucleus are called: _____ layers
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Parvocellular layers (Layers 3, 4, 5, & 6
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Injury to these layers of the LGN reduces the ability to detect fast-moving visual stimuli.
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Magnocellular
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Damage to these layers of the LGN results in elimination of color vision and impairs visual acuity w/o affecting perception
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Parvocellular
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