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Anatomy
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The transparency of the cornea :

uniform structure, avascularity, and deturgescence.

Slide 75

Anatomy

Slide 76

The Uveal Tract

The Uveal Tract

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iris, the ciliary body, and the choroid

iris, the ciliary body, and the choroid

It contributes blood supply to the retina.

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Iris

Iris

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dividing the anterior chamber from the posterior chamber, each of which contains aqueous humor.

dividing the anterior chamber from the posterior chamber, each of which contains aqueous humor.

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The blood supply : major circle of the iris .

The blood supply : major circle of the iris .

Iris capillaries have a nonfenestrated endothelium and hence do not normally leak intravenously injected fluorescein.

Sensory nerve supply: fibers in the ciliary nerves.

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The Ciliary Body

The Ciliary Body

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It consists of a corrugated anterior zone, the pars plicata , and a flattened posterior zone, the pars plana .

It consists of a corrugated anterior zone, the pars plicata , and a flattened posterior zone, the pars plana .

The ciliary processes arise from the pars plicata .

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The capillaries are large and fenestrated and hence leak intravenously injected fluorescein.

The capillaries are large and fenestrated and hence leak intravenously injected fluorescein.

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The ciliary processes and their covering ciliary epithelium are responsible for the formation of aqueous.

The ciliary processes and their covering ciliary epithelium are responsible for the formation of aqueous.

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The ciliary muscle is composed of a combination of longitudinal, circular, and radial fibers.

The ciliary muscle is composed of a combination of longitudinal, circular, and radial fibers.

The function of the circular fibers is to contract and relax the zonular fibers, which originate in the valleys between the ciliary processes.

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The blood vessels supplying the ciliary body are derived from the major circle of the iris.

The blood vessels supplying the ciliary body are derived from the major circle of the iris.

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The Choroid

The Choroid

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the posterior segment of the uveal tract, between the retina and the sclera.

the posterior segment of the uveal tract, between the retina and the sclera.

The internal portion of the choroid vessels is known as the choriocapillaris.

The choroid is bounded internally by Bruch's membrane and externally by the sclera.

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