Ciliary Process

1) CAPILLARY NETWORK:

-Occupies centre of each process.
-Very thin endothelium with fenestrae or false pores lined by basement membrane.
-Mural cells / pericytes are absent.

2) STROMA:

-Very thin.
-Separates the capillary network from epithelial layers.
-Consists of: ground substance (mucopolysaccharides, proteins, solute of plasma), few collagen connective tissue fibres, wandering cells.

3) TWO LAYERS OF EPITHELIUM:

-Arranged with their apical surfaces in apposition to each other.
-OUTER PIGMENTED EPITHELIUM: contains numerous melanin granules.
-INNER NON-PIGMENTED EPITHELIUM: contains mitochondria, zonula occludentes, lateral & surface interdigitations.

-The tight junctions between cells of this layer create part of the blood–aqueous barrier.
-Basement membrane lines the double cell layer & constitutes the internal limiting membrane (ILM) on the inner surface.


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