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27 Cards in this Set

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