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Is structure of ratina is different in different people?

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Retina

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For other uses, see Retina (disambiguation).

The retina is the innermost, light-sensitivelayer, or "coat", of shell tissue of the eye of most vertebrates and some molluscs. The optics of the eye create a focused two-dimensional image of the visual world on the retina, which translates that image into electrical neural impulses to the brain to create visual perception, the retina serving much the same function as film or a CCD in acamera.

Retina

Right human eye cross-sectional view; eyes vary significantly among animals.

DetailsPronunciationUK: /ˈrɛtɪnə/,
US: /ˈrɛtənə/,
pl. retinae /-ni/Part ofEyeSystemVisual systemArteryCentral retinal arteryIdentifiersLatinRēteMeSHD012160TAA15.2.04.002FMA58301Anatomical terminology

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The retina consists of several layers ofneurons interconnected by synapses. The neural retina refers to the three layers of neural cells (photo receptor cells, bipolar cells, and ganglion cells) within the retina, which in its entirety comprises ten distinct layers, including an outer layer of pigmented epithelial cells. The only neural cells that are directly sensitive to light are thephotoreceptor cells, which are of two types:rods and cones. Rods function mainly in dim light and provide black-and-white vision while cones are responsible for the perception of colour. A third type of photoreceptor, thephotosensitive ganglion cells, is important forentrainment and reflexive responses to the brightness of light.

Light striking the retina initiates a cascade of chemical and electrical events that ultimately trigger nerve impulses that are sent to various visual centres of the brain through the fibres of the optic nerve. Neural signals from the rods and cones undergo processing by other neurons, whose output takes the form ofaction potentials in retinal ganglion cellswhose axons form the optic nerve.[1] Several important features of visual perception can be traced to the retinal encoding and processing of light.

In vertebrate embryonic development, the retina and the optic nerve originate as outgrowths of the developing brain, specifically the embryonic diencephalon; thus, the retina is considered part of the central nervous system (CNS) and is actually brain tissue.[2][3] It is the only part of the CNS that can be visualized non-invasively.

Structure

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Last edited 30 days ago by JCW-CleanerBot



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Answer 2

hey mate ,

    here is your answer :)

************

the structure of retina is same for all