Lecture Notes - Eye, Ear and Skin
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| The skin is: | largest & one of most important organs of the body
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| The 3 structures of the skin are: | -Epidermis
-Dermis
-Subcutaneous
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| Epidermis: | outermost layer of skin
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| Dermis: | largely made of connective tissue & network of nerves & nerve-endings
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| Subcutaneous: | loose connective tissue & fat; the fat insulates body from heat & cold
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| Stratum germinativum: | innermost layer where cells reproduce
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| Stratum corneum: | outer layer of epidermis, produces keratin, which is waterproof, provides cells with abrasion-resistance & protective quality
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| Accessory structures of the skin are: | 1. Hair
2.Nails
3.Skin glands
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| Functions of the skin: | 1.Protect
2.Temp regulate
3.Sense organ activity
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| The Sclera: | white of eye
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| Choroid: | middle layer of eye; contains dark pigment to prevent scattering of light rays
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| The Retina: | innermost layer of eye; contains rods & cones
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| Accessory structures of the eye: | 1.Cornea
2.Iris
3.Pupil
4.Lens
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| The Cornea: | on front surface of sclera(white) AKA window of eye b/c of transparency
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| The Iris: | colored part of eye
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| The Pupil: | black center of iris
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| The Lens: | directly behind pupil
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| The "blind spot" is known as: | optic disc
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| The ear is divided into: | 1.External ear
2.Middle ear
3.Inner ear
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| External ear: | (2 parts)auricle/pinna & external auditory canal
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| Middle ear: | tiny & thin cavity hollowed out of temporal bone
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| The organ of Corti is: | organ for hearing; lies in the "snail" cochlea
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| An ear disorder: | hearing loss
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| An eye disorder: | astigmatism
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| A skin disorder: | psoriasis
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