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Eyes
Chapter 14
| Term | Definition |
|---|---|
| adnexa | accessory structures of an organ |
| Stroma | describes supporting tissue of an organ |
| Orbit | bony cavity of the skull that contains the eyeball |
| Periorbita | means eyesocket |
| 2 Oblique, 4 Rectus, 1 Retractor Bulbi | 7 eye muscles |
| Binocular | both eyes |
| Extrinsic Muscles | 6 muscles that attach the outside of the eyeball to the bones of the orbit |
| Levator Palpebrae | muscles that raise the upper eyelid |
| Canthus | the angle where upper and lower eyelids meet |
| Tarsal Plate | platelike framework within the upper and lower eyelids that provide stiffness and shape |
| Meibomian Glands | sebaceous glands on the margins of each eyelid also called the tarsal glands |
| Cilia | hairlike structures at the edge of each eyelid |
| Conjunctiva | mucous membrane that lines the underside of each eyelid |
| Nictatating membrane | conjunctival fold attached at the medial canthus that moves across the cornea when closed also called the third eyelid or nicitans or haws |
| lacrimal apparatus | structures that produce, store, and remove tears |
| Lacrimation | the condition of normal tear secretion |
| Lacrimal Canaliculi | ducts at the medial canthus that collect tears and drains them into the lacrimal sacs |
| Dorsal punctum | small spot near the upper medial canthus where the nasolacrimal duct begins |
| Ventral punctum | small spot near the lower medial canthus where the nasolacrimal duct begins |
| Sclera | outer layer of the eye that helps maintain shape |
| choroid | opaque middle layer of the eye |
| Cornea | transparent anterior portion of the sclera |
| Descemets Membrane | innermost layer of the eye |
| Tapetum Lucidum | brightly colored iridescent reflecting tissue layer of the choroid |
| Tapetum Nigrum | black pigmented tissue layer of the choroid |
| Iris | pigmented muscular diaphragm of the choroid that surrounds the pupil |
| pupil | circular opening in the center of the iris |
| Constriction | making the opening smaller |
| Miosis | pupillary constriction |
| Dilation | making the opening larger |
| Mydriasis | pupillary dilation |
| Lens | clear, flexible, avascular, curved capsule located posterior to the iris and pupil |
| Ciliary muscles | muscles that adjust the shape and thickness of the lens |
| retina | nervous tissue layer that receives images and lines the posterior chamber of the eye |
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Tuffenuff
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