Term
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Definition
| "whites" of the eyes (can only see a portion of this - most is behind eyelids) |
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Definition
| transparent center part in front of the iris - helps bend/refract light rays |
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Definition
| pigmented part of the eye - mine are "blue", for ex |
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Definition
| opening in the iris - light rays enter |
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Term
| What lines the sclera and eyelid (on the anterior eye but doesn't cover the cornea)? |
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Definition
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Term
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Definition
mucous membrane, secretes mucous - lines the sclera and eyelid
-it contains blood vessels |
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Term
| What is the function of conjunctiva? |
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Definition
| secretes mucous as a lubricant - it is dried eye goop in the morning |
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Term
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Definition
| 'pink eye' - inflamed conjunctiva - most are viral in origin - does not properly lubricate the eye (thick green, goopy mucous) |
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Term
| What is the lacrimal apparatus and what does it contain? |
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Definition
-It produces and collects tears (lacrimal fluid)
-It contains water, Na+ (sodium), antibodies (fight infection), and lysozyme (antibacterial agent) |
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Term
| What are the three parts of the lacrimal apparatus? |
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Definition
| lacrimal gland, lacrimal canaliculi, and nasolacrimal duct |
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Term
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Definition
| produces and secretes tears - on the upper lateral portion of each orbit - secretes tears on a constant basis - when blink, tears lubricate the eye |
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Term
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Definition
| a canal going from the lacrimal puncti (hole that excess tears go into) to the nasolacrimal duct (which drains tears) |
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Term
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Definition
| drains tears into nasal cavity, where they are eventually swallowed |
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Term
| When a person cries, tears spill onto the cheeks and the person gets a runny rose. Based on your knowledge of the lacrimal apparatus, what is happening? |
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Definition
| • The lacrimal apparatus reaches its threshold and overflows - overproduction of tears overflows the system |
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Term
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Definition
| eye muscle that moves the eyes medially - adducts the eye (look at nose) |
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Term
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Definition
| eye muscle that moves the eyes laterally - abducts the eye |
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Term
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Definition
| muscle located at top of eyeball - elevates the eye (look up) and moves it medially (adducts eye) |
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Term
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Definition
| muscle located on bottom of eyeball - depresses the eye and moves eye medially |
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Term
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Definition
| muscle that attaches to upper back part of eyeball - depresses eye and moves eye laterally |
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Term
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Definition
| muscles that attach to inferior back of eye - elevates eye and moves eye laterally |
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Term
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Definition
biconvex (rounded on both sides) - transparent structure inside the eyeball
-function: to refract (bend) light rays
-held in place by suspensory ligaments (change shape of lens for different types of vision) |
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Term
| What happens to the lens when suspensory ligaments are taut? |
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Definition
| the lens flattens for far vision - allows for less refraction/bending of light rays |
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Term
| What happens to the lens when suspensory ligaments are loose? |
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Definition
| the lens becomes puffier (rounder) for near vision - allows for more refraction/bending of light rays |
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