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18 Jan 2012
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The pathway that neural signals follow once they leave the retina. Most of the signals travel out of the eye to the lateral geniculate nucleus (lgn) in the thalamus. Then travel to the primary visual receiving area (striate cortex) in the occipital lobe. From there, signals are transmitted to the temporal lobe or to the parietal lobe, some signals also reach areas in the frontal lobe. Superior colliculus, an area involved in controlling eye movements and other visual behaviours. Recordings show that lgn neurons have the same centre-surround configuration as retinal ganglion cells. Thus they respond best to small sports of light on the retina. 90% of fibres in the optic nerve arrive at the lgn (10% go to superior colliculus) Lgn also receives signals from the cortex, the brain stem, other neurons in the thalamus and from other neurons in the lgn. It then sends its output to the cortex.

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