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18 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Where in the body is glutamate inhibitory?
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on "on-center" bipolar cells in response to no light.
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What is another name for tarsal glands what do they do and where are they located?
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Meibomian gland, they secret oily substance that lubricates lids to prevent tears from overflowing to the face, located in superior tarsal plate
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What kind of muscle is the superior tarsal muscle and what kind of control is it under?
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Smooth muscle, sympathetic control
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What is the function of the bulbar fascia and what's another name for it?
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Connective tissue that keeps the eye in the orbit, Tenon's capsule
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Explain how close vision works and what is it's control?
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Ciliary muscles contract, relaxing zonula fibers (suspensory ligaments) balling up the lens. Parasympathetic control
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/What causes Glaucoma?
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Cell death in capillary beds blocking drainage of aqueous humor at the spaces of Fontana and increasing intraocular pressure
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What happens in prehyopia?
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The lens doesn't ball up well
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Explain the blood supply to the retina and choroid
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Inner and neural part of retina: central artery of retina
photoreceptors and choroid: short ciliary posterior artery |
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What is papilledema?
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-optic disc swelling
- usually bilateral (could be unilateral) - caused by increase intercranial pressure |
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What goes through the common tendinous ring above and below it (side 3)?
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1) sup. + inf. oculomotor nerve
2) Nasociliary nerve (V1) 3) Abducens nerve 4) optic nerve 5) opthalmic artery 1,2,3 via supraorbital fissure 4,5 via optic canal |
Above:
1) frontal (V1) 2) nasal (V1) 3) trochlear 4) superior opthalmic vein Below: 1) inferior opthalmic vein all via supraorbital fissure |
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What does MS attack in the eye?
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Abducens nerve=diplopia
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What does the amacrine neuron do?
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- involved with length of time of light change
- retina picks up change in environment i.e. movement, blinking lights |
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What nerves do the sympathetic and parasympathetic nerves of eye travel?
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sympathetic: long ciliary nerve
parasympathetic: short ciliary nerve |
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What is the near triad?
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events that occur during close vision, controlled by edinger-westphal
1) convergence 2) constriction of pupils 3) A-P thickening of lens |
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Which area is more active during smooth pursuit?
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area 21
- pontine nucleus, cerebellum, vestibuli nucleus also involved |
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The ____ of the horizontal visual field is conveyed by the most posterior portion of the visual cortex.
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Center
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The left visual field of the left eye crosses the optic chiasm. t or f
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true
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The inferior visual field is conveyed _____ to the calcarine fissure
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superior to calcarine (cuneus area)
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