Blood Supply Of Sclera

The anterior part of the sclera is vascularised by the episcleral plexus. It is thus a free anastomosis between the 2 internal carotid art and vertebral art.

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Blood supply of sclera. Sclera is the white part of the eye that covers more than 80 of the eye including the cornea. Tenons Capsule Fascia Bulbi Slide 59. Posterior fifth-sixths of the eyeball blood supply.

The arterial blood supply is derived from the anterior and posterior ciliary arteries arising from the ophthalmic artery. The ophthalmic artery then branches into the short posterior ciliary arteries which pierce the sclera and supply the choroid up to the equator of the eye. This equalizes the pressure on both side and allows blood that enters by either internal or vertebral artery to supply blood to any pat of both the cerebral hemispheres.

It functions to protect the intraocular contents. Anterior ciliary and palpebral arteries. Conjunctiva is a highly vascularized tissue while sclera has a limited blood supply.

The well-vascularized episclera is the outermost layer of the sclera attaching to the fibrous Tenons capsule that envelops the globe and is adherent to the conjunctiva. It forms the supporting wall of the eyeball and is continuous with the clear cornea. Anterior ciliary arteries There are 7 of these arteries per eye and they supply the sclera and rectus muscles.

The blood supply to this part is entirely by the ACAs 49 52. In many vertebrates the sclera is reinforced with plates of cartilage or bone together forming a circular structure called the sclerotic ring. Many arterioles from the limbal region supply the peripheral cornea.

In addition there are a number of blood vessels passing through the sclera including those that supply the conjunctivathin transparent membrane covering the sclera iriscolored part of eye choroidlayer of tissue between the. Scleral stroma is relatively avascular and receives its nutrition mainly from episcleral vascular bed and to some extent from the underlying choroidal vasculatures. Paired arteries that pierce the sclera outside the circle of Zinn snd travel forward in the suprachoroidal space to the ciliary body Gives recurrent branches that supply the choroid anterior to the equator and anastomose with short post ciliary aa.

They branch from the ophthalmic artery and pass forwards to the anterior aspect of the eyeball where they pierce the sclera near the cornea and terminate in the circulus arteriosus major that surrounds the iris. Fibrous membrane that envelops the globe from the limbus to the optic nerve. The episclera recieves its blood supply from the anterior ciliary arteries anterior to the insertions of the rectus muscles and the long and short posterior ciliary arteries.

Are the major blood supply to the globe Long post. It also has its own nerve supply and is supplied by the long ciliary nerves anteriorly and short ciliary nerves behind the equator. Perforating branches of the ACAs before penetrating the sclera give branches to supply the limbus.

Perforating branches contribute to the vascular supplies of the deep limbal structures and the anterior uvea. The major blood supply to the eye is from the external carotid artery Venous blood leaves from the angular vein deep facial vein ophthalmic veins Superficial temporal artery. The sclera is covered by the conjunctiva a clear mucus membrane that helps lubricate the eye.

The sclera is an opaque layer which surrounds the posterior five-sixths of the eyeball. Major circle of iris f lies in pars plicata and sends branches posteriorly into ciliary body as well as forward into iris g. Their superficial branches form arcades to supply the limbal conjunctiva and peripheral cornea.

Blood supply and innervation. It is thickest. The cornea is a transparent layer that is anteriorly continuous with the sclera.

Some blood vessels pass through the sclera to other tissues but the sclera itself is considered avascular lacking blood vessels. Both are protective layers of the eye. The first ophthalmic division of the fifth nerve.

The sclera is relatively inactive metabolically and has only a limited blood supply. Circle of Zinn lies in sclera and furnishes part of blood supply to optic nerve and disc. The scleras blood vessels are mainly on the surface.

Adjacent to the limbus the conjunctiva Tenons capsule and episclera are fused together. The innermost portion of the sclera called the lamina fusca also contain blood vessels but they are not visible. Cortical and central branches arise from the circle and supply the brain substance.

Circle of Zinn h is formed by pial branches i as well as branches from short posterior ciliary arteries. The limbus is the region between the transparent cornea and opaque sclera. It receives its supply through the anterior ciliary arteries long posterior ciliary arteries and short posterior ciliary arteries.

Along with the vessels of the conjunctiva which is a thin layer covering the sclera those in the episclera render the inflamed eye bright red. Long posterior ciliary arteries run a similar course but move further into the eye to supply the anterior aspect of the choroid in addition to the iris and ciliary bodies. The vasculature of the limbus derives in primates primarily from the anterior ciliary arteries.

Conjunctiva is the thin transparent layer that lies on the sclera and interior lining of eyelids. There is a direct supply of blood to the sclera. Scleras or sclerae is the fibrous opaque white coat of the eye.

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