The Ganglionic Layer is the
third (3rd) of the layers
forming the retina
of the human eye that light reaches after entering the eye: That is, after
light from outside the body enters the eye through it's main structures
of the cornea,
aqueous
humour, pupil,
lens,
etc..
The retina is composed of several layers which, together, form the "screen"
in the eye onto which an image of the area viewed by the eye is formed,
and information about that image is segmented into packets of information
that are passed to the visual cortex of the brain via the optic
nerve.
The ganglionic layer is a single layer of large ganglion
cells that stretches across the whole of the retina. The only exception
to this is in the region of the fovea
(also known as the "macula lutea" and as the "yellow spot"), there are
several strata of these large ganglia - instead of the single layer elsewhere
across the retina.
The ganglionic layer can be identified in the small diagram
of the retina (at the top-right of this page) as a layer formed from the
symbols represented by pale circles with dark centres a short distance
upwards from the lower part of the structure illustrated.
For more information about related subjects see:
*_ Structure
& Components of the Eye,
*_ Components
of the Central Nervous System,
*_ The
Pathway of a Nerve Impulse,
*_ Structures
and Functions of Neurones,
*_ Diseases
and Disorders of the Nervous System,
*_ Text
books about Ophthalmology.
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