BMS 870 Lecture Notes - Lecture 13: White Matter, Pyramidal Cell, Opponent Process
24 Dec 2017
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Document Summary
~100 mill photoreceptors in retina + 1 mill axons leave eye in the optic nerve. Retina -> lateral geniculate nucleus -> 1 visual cortex -> higher order visual areas in occipital, temporal, and parietal lobes. Cones - small receptive fields; need high-light to see colour. Rods - large receptive fields needed for periphery. The retinal pathway that leaves eye that begins with optic nerve. Visual information from optic nerve -> optic chiasm - nasal neurons decussate, temporal neurons don"t -> optic tract -> lgn (in thalamus) -> 1 visual cortex (in occipital lobe) Optic chiasm - not a synapse! some of the neurons cross over here. Depth perception due to overlap of visual fields. Temporal neuron of right eye -> right optic nerve -> right optic tract -> lgn. Nasal neuron of left eye -> left optic nerve -> optic chiasm -> right optic tract -> lgn.
