LING 1200 Lecture Notes - Lecture 33: Optic Disc, Ganglion Cell, Retina
13 May 2017
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Document Summary
Rods and cones report information about light energy reflected off objects to bipolar neurons which report to ganglion cells which exit the eye at the optic disc and form the optic nerve. Ganglion cells: axons bundle up forming the optic nerve to the brain. Myelin coating on axons are essential for vision. Heavily coated makes it quick (visual perception system needs to be fast. No rods or cones at the optic disc, so people are blind for information at that spot (blind spot) Optic disc (blind spot): right in the middle of the field of vision. Photoreceptors respond to amounts of light at a certain part of the visual field. Amount of light determines rate of firing in ganglion cells (these cells send this information on to the brain) Once occipital lobe detects the information, other areas of the brain use this information to detect the presence of more complex objects.
