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Vascular Tunic - Vision Vascular Tunic(Uvea Inner layer of...

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Vision Vascular Tunic (Uvea) * Inner layer of the eyeball * Has three layers * choroid * ciliary body * iris Vascular Tunic: Choriod * highly vascularized * is the posterior portion of the vascular tunic that lines most of the internal surface of the sclera Vascular Tunic: Ciliary Body * choroid becomes the ciliary body toward the anterior portion of the vascular tunic * extends from the ora serrata (the jagged anterior margin of the retina) to the point just posterior to the junction of the sclera and cornea Vascular Tunic: Ciliary Body * consist of the * ciliary processes- protrusions or folds on the internal surface of the ciliary body * contain blood vessels and secrete aqueous humor * zonular fibers (suspensory ligaments- extends from the ciliary processes to the to the lens * ciliary muscle- circular band of smooth muscle that contracts and relaxes the alter the shape of the lens to adapt it for near or far vision Iris Vascular Tunic: Iris * flat donut shaped colored portion of the eyeball *
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