Question

CheCk tor Updates An object of interest is to your right. The light from this object excites the temporal left eye and the nasal right eye as shown in the figure to the right. emporalstemporal 13-Q6: What happens to the organization of that image from the retina to te the LGN and then to primary visual cortex? That is, what is the anatomical organization of the visual circuitry? Include the organization of the terminal projections in the LGN and cortex.

Answer 1

The light rays in visible wave lenght focused on the retina through the cornea lens generate potential (impulses) in rods and cones.The photosensitive compounds (photopigments) in the human eyes is composed of opsin (a protein) and retinal ( an aldehyde of vitamin A). light induces dissociation of the retinal from opsin resulting in changes in the structure of the opsin .This causes membrane permeability changes .As a result potential differences are generated action potentials in the ganglion cellls through the bipolar cells .These action potentials(impulses)are transmitted by the optic nerves to the visual cortex area of the brain,where the neural impulses are analysed and the image formed on the retina is recognised based on the earlier memory and experiance.
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