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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