01:830:331 Lecture Notes - Lecture 27: Visual Cortex, Optic Chiasm, Calcarine Sulcus
24 Jul 2016
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~the axons of ganglion cells go through optic nerve, through optic chiasm, ascend up to dorsal lateral geniculate nucleus (dorsal lgn) in thalamus, then to primary visual cortex. ~the dorsal lgn has six layers of neurons, each layer gets info from one specific eye. Inner two layers = magnocellular, have larger neuron cells (layers 1, 2) Outer four layers = parvocellular, smaller cells (layers 3, 4, 5, 6) ~neurons in lgn have same properties as the ganglion cells, but larger convergence. ~then, the axons of neurons in lgn go through the optic radiations pathway to primary visual cortex. ~primary visual cortex is area around calcarine fissure. ~primary visual cortex also known as striate cortex, because has striatum of cells. ~the two optic nerves (one from each eye) cross and separate at the optic chiasm. Optic chiasm is at the very bottom of the brain, since your eye level is at the bottom of your brain.
