The Membrana Limitans Externa
is the eigth (8th) of the
layers forming the retina
of the human eye that light reaches after entering the eye - through 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.
In common with the Membrana
Limitans Interna, the membrana limitans externa is
formed from the Fibres of Müller.
These fibres of Müller (also known as "radiating fibres")
form the supporting framework that connects the layers of the retina together
and also forms the Membrana Limitans Interna and the Membrana
Limitans Externa.
These layers are so named because they form the two limits between which
the fibres of Müller are attached. As the fibres of Müller are
stretched between these two "limiting layers", they therefore
pass through all of the layers in between - which includes all of the
"nervous layers" except Jacob's
Membrane (layer 9).
The fibres of Müller unite to form the Membrana Limitans
Externa at the bases of the rods and cones of Jacob's Membrane.
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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