Eyeball - choroid, CHOROI D - Thin, net like made up of connective tissue, rich, Biology

Eyeball - choroid, Biology

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CHOROID -

Thin, net like made up of connective tissue, rich in blood vessels.
Pigment present, red in rabbit, brown or black in man. It reduces internal reflection.
Except cornea this layer is attached to sclerotic.
In front of cornea this layer froms a thin coloured partition i.e. iris. IRIS -
It is perforated in the middle by an aperture pupil. Iris is highly muscular
Circular and radial muscles are present. Circular muscles are sphincter type. Radial muscles are dilator type.
On contraction of circular muscles diameter of pupil is reduced it is myosis, it takes place in sharp light.
On contraction of radial muscles diameter of pupil is increased, it is mydriosis, it occurs in dimlight.
Atropine is used to dialate pupil.

Basal part of iris is highly muscular having circular, radial and obligue muscles. It is known as cilliary body.
On its free surface 70 - 80 cilliary processes present secretes aquous humour in aquous chamber.
Cilliary body also affects convexity of lens.

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