BIO SCI N110 Lecture Notes - Lecture 4: Lateral Geniculate Nucleus, Visual Cortex, Retinal Ganglion Cell
12 Jul 2019
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Weds | 5. 1. 19 from the lateral geniculate nucleus to the primary visual cortex. Basic anatomy of the visual system (very) basic anatomy of the visual system: right hemisphere: optic nerve, optic chiasm, lateral geniculate nucleus, optic radiation, striate cortex, v1 and v2, at least 32 visual cortical areas after v1. Information from periphery reaches the cortex through the thalamus. Rule #2: sensory information is topographically organized, adjacent spots in the visual field are encoded in adjacent retinal ganglion cells, lgn cells, and v1 cells. In the visual system, this topographical organization is called retinotopic. Some types of topographic information: retinotopic organization (vision, tonotopic organization (audition, somatotopic organization (touch) "newer" system = "conscious" processing of visual information. Rule #5: within a sensory system, feedforward connections are usually accompanied by feedback connections, note: the largest input to the lgn is from v1. So what does the lgn do: directed attention to a spatial location modulates neural activity in the lgn:
