HTHSCI 1LL3 Lecture Notes - Lecture 8: Amacrine Cell, Visual Cortex, Optic Disc
29 Apr 2016
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Document Summary
Variations in amplitude are changes in light brightness. Variations in wavelength affect perception of colour. We"re only sensitive to a tiny portion of the colour spectrum. Transparent window at the front of the eye. Band of muscles controlled by the brain. Focuses light to the back of the eye. Curvature of the lens causes us to view things upside down. Lens gets rounder if object is close. Lens gets elongated if object is far. Where the physical stimulus of light is rst translated into neural impulses. Thin sheet covering the back of the eye. Converge to optic disc, optic nerve, brain. Cells that allow cells to communicate with one another: horizontal and amacrine cells. Allow cells to communicate and combine information. Photoreceptors, bipolar cells and ganglion cells combine information to send one combined neural signal to the optic disc, nerve and brain. Right visual eld travels to left hemisphere. Left visual eld travels to right hemisphere.
