PSYCH 2E03 Lecture Notes - Retinal Ganglion Cell, Retinal Detachment, Retinal Pigment Epithelium
13 Jun 2013
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Document Summary
Store vitamin a (retinol) for rhodopsin synthesis. Note: pigment layer is vital for the survival of photo-sensitive layer of retina retinal detachment: separation of photo-sensitive lauer from pigment layer leads to acute blindness. Photosensitive layer separates from the pigment layer. Bipolar layer: some neurons which have two processes in the cell body some neurons may be multipolar: ganglion cells. Photosensitive layer light penetrates innermost layer to attain the outer layers (rods and cones) High convergence: several cones/rods synapse with bipolar, several bipolar converge with retinal ganglion cells low convergence in cone-fed circuits: 1:1:1 ratio. Distribution of rods & cones fovea cones only. Bipolar cells at synapse rods: disks stacked have photosensitive pigments cones: folded, pleats contain pigments. Rod & cone pigments rod: rhodopsin cone: iodopsin. Disc are modified from the cell, have properties of the membrane. Rhodopsin: structure segment of the disc of rods. Disc contains thousands of molecules of rhodopsin. Protein, opsin, with 7 folds across the disc.
