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Optic disk
- where RG axons come together to exit eye..
- (as optic nerve)
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Accommodation
constrict ciliary m, lens relax and become more naturally spherical
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PR cell
- 1,000 flattened discs- R
- half- C
- site of photon-capture
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RPE
- 1. phagocytosing membrane disc
- 2. recyling 11-cis-retinal
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Rods
- Longer, cylindrical OS, more photopigment
- SEPARATE plasma memb, free-floating organelles
- 95%
- *convey ONLY "total" light intensity (luminance) to brain
- high sensitivity
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Cones
- Smaller, conical shapped OS
- Discs= envagination of plasma memb, continuous memb sheet
- 5%
- LOW SENSITIVITY, HIGH TEMPERAL RESOLUTION
- dense at fovea, only-at foveola
- *convey color (wl) & "total" intensity to brain
- loss is more detremental
-
-
-
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Color perceptn
- COnfusion in int and wl
- need to compare intensities
-
-
-
bdrop in Ca
- 1. inc affin for cGMP
- 2. Inc guanylate cylase
- 3. inc rhodopisn kinase
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