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Accessory Structures of the Eye

Accessory Structures of the Eye - anterior cornea posterior...

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Vision Accessory Structures of the Eye Lacrimal Apparatus * group of structures that produce and drains lacrimal fluid or tears * lacrimal gland- secrete lacrimal fluid into 6-12 excretory lacrimal ducts that empty tears onto the surface of the conjunctiva of the upper lid. * tears pass medially over the anterior surface of the eyeball to enter two openings called the lacrimal puncta , then to the lacrimal canals , which lead into the lacrimal sac and then into the nasolacrimal duct . Lacrimal Apparatus Anatomy of the Eyeball * about 1” diameter and only 1/6 exposed * Consist of three layers * fibrous tunic- the superficial coat of the eyeball * vascular tunic- the middle layer * retina- the inner layer Fibrous Tunic * the superficial coat (outer layer) of the eyeball * is avascular and consist of
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Unformatted text preview: * anterior cornea * posterior sclera Fibrous Tunic: Cornea Fibrous Tunic: Cornea * Because of its curvature, most of the bending of the light rays (refraction) occurs at the cornea. * Outer surface consist of nonkeratinized st. sq. epi. * Middle coat consist of collagen fibers and fibroblast * Inner surface is simple squamous epithelium Fibrous Tunic: Sclera * the white of the eye * a layer of dense c.t., mostly collagen fibers and fibroblast * covers the entire eyeball except the cornea * gives the eyeball shape, makes it more rigid, and protects its inner parts * scleral venous sinus (canal of Schlemm)- an opening located at the junction of the sclera and cornea that drains fluid (aqueous humor)....
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