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11 Cards in this Set
- Front
- Back
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What is the sclera? |
The sclera is thewhite ofthe eye –a toughfibrous coat that protects the inner eye and gives it shape |
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What is the cornea? |
The cornea is aprotective cover over the lens, contains “aqueous humor” inthe anterior chamber, refracts light rays to focus them onto the retina |
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What is the choroid? |
The choroid isdarkbrown pigmented membrane that lines the sclera; lots of blood supply to nourishthe retina; pigmented to absorb light rays |
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What is the ciliary body? |
The ciliary body extendsfrom the retina to the base of the iris; contains muscles that alter the shapeof the lens for focusing; secretes the aqueous humor |
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What is the iris? |
The iris is thecoloured part of the eye; a muscular diaphragm that alters the size of thepupil |
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What muscles change the size of the pupil? |
The pupil changesinsize depending on the contraction of antagonistic muscles(circularand radial muscles) |
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What is the retina? |
–Linesthe posterior of the eyeball, contains the “vitreous humor” –Madeup of nervous tissue and a pigmented layer, involved in image formation –Thenervous tissue ends in a jagged border near the ciliary body called the oraserrata –Thepigmented layer continues over the ciliary body and the iris (ciliaryportion of eye) |
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What is the macula lutea? |
The macula lutea isthesmall area at the opticcentre ofthe retina |
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What is the fovea? |
The fovea is the small depression in the center of the macula, with the highest concentration of cones (photoreceptors) |
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What is the optic disc? |
The optic disc is wherethe ganglion neurons bend posteriorly from the optic nerve (aka blind spot) |
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What is the posterior cavity? |
•betweenthe lens and retina –Filledwith vitreous humour (jelly-likeliquid) –Thiscreates pressure to prevent the eyeball from collapsing and tohold theretina against the choroid –Ifthe retina comes away from the choroid, this is called a detachedretina |
