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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