bio 243 - ch.15 horizontal notes

bio 243 - ch.15 horizontal notes - Structures and Functions...

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Structures and Functions of Eyeball Part Structural Characteristics Function OUTER LAYER Sciera white of eye support and protection attachment for extrinsic eye muscles Cornea - refracts light rays Corneoscieral Junction - drainage of aqueous humor MIDDLE LAYER Choroid - absorbs light prevents internal reflection blood vessels nourish retina elastic pull keeps lens flat Ciliary Body - muscle contraction allows accommodation for near vision Iris - serves as diaphragm to control amount of light entering the eye INNER LAYER Lining of ciliary body and iris - -
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Structural Characteristics Function Retina transparent layer of inner pigmented and outer neural tissue 1. Neurons (ganglion cells, bipolar neurons, etc) 2. photoreceptor cells a. rods b. cones 3. optic disc (blind spot) conduct nerve impulse contain visual pigments serve as chemoreceptors to transduce light energy function in dim light bright light and color vision convergence of axons of the ganglion cells to form the optic nerve (II)
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This note was uploaded on 11/08/2011 for the course BIOL 243 taught by Professor Datt during the Spring '08 term at South Carolina.

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bio 243 - ch.15 horizontal notes - Structures and Functions...

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