At back inner eyeball, visual receptor-cell layers {retina}| have 90 million rod cells, one million cones, and one million optic nerve axons.
cell types
Retina has 50 cell types.
cell types: clustering
Retina has clusters of same cone type. Retina areas can lack cone types. Fovea has few short-wavelength cones.
development
Retina grows by adding cell rings to periphery. Oldest eye part is at center, near where optic nerve fibers leave retina. In early development, contralateral optic nerve fibers cross over to connect to optic tectum. In early development, optic nerve fibers and brain regions have topographic maps. After maturation, axons can no longer alter connections.
processing
Retina cells separate information about shape, reflectance, illumination, and viewpoint.
Consciousness>Consciousness>Sense>Vision>Anatomy>Eye>Retina
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Date Modified: 2022.0224