The term Geniculostriate system/pathway refers to the visual pathway that goes from the optic nerve/chiasm/tract to the lateral geniculate nucleus (LGn) of the thalamus and then, via the optic radiations, from the LGN to the primary visual cortex (V1) which is often called the striate cortex. This is by far the most important visual pathway in the human brain; however, a considerable number optic tract fibers continue past the LGN to synapse in the brainstem, these would be the “extrageniculostriate” visual pathways.
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