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14 Cards in this Set
- Front
- Back
Anterior Chamber
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In anterior cavity
behind cornea, in front of iris |
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Posterior chamber
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in anterior cavity
in back of iris, in front of lens *aqueous humor |
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Aqueous humor
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produced by the ciliary body
returned to circulation through the CANAL OF SCHLEMM replaced every 90 mins increase pressure = glaucoma |
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canal of Schlemm
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scleral/coronal junction
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posterior cavity
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vitreous body (humor)
get like inconsistency not ever replaced hold retina in place viscous ground substance |
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retina
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the size and thickness of a postage stamp
-macula lutea -fovea centralis -optic disc |
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macula lutea
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small yellow spot, 4 mm in diameter
exact center of the posterior of the retina |
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fovea centralis
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in the center of the macula lutea; small depression
normally where light is focused point of greatest visual acuity cones are mostly densely packed here; 35,000 in that spot - no rods |
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optic disc
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just medial to the macula lutea
white spot where nerve processes all meet from the photoreceptors all around the retina and exit the eye blood vessels enter and leave the eyeball via optic nerve |
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reinta is made up of two parts:
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1. the pigmented epithelial cells
2. the sensory retina |
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the pigmented epithelia cells
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people with albinism have no pigment; pupil looks red due to blood vessels
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the sensory retina
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3 layers:
1. photoreceptors - rods and cones (not neurons) 2. bipolar cells 3. ganglion cells = axons become cranial 2 -only the ganglion cells generate action potentials; the rest are grated potentials |
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rods
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120 million
rhodopsin is the photopigment sensitive to low light night vision; detect movement *MORE IN NOTES**** |
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cones
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6 million
fovea centralis not found in periphery iodopsin is the photopigment color vision and visual acuity *MORE IN NOTES**** |