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Chapter 16 The Special Senses
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Smell
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Taste
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Effects of Different tastes on neurons
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Eye terminology Lacrimal apparatus Lysozymes Meibomian glands Extrinsic eye muscles
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Tunics Fibrous tunic –Cornea (cover) –Sclera (white Vascular Tunic –Choroid (vascular) –Iris (colored) –Ciliary body (muscle) –Pupil (light regulation) Retina –Photoreceptor layer –Rods and cones –Fovea centralis –Optic disc
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Responses of Pupil to Light
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Normal Retina
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Refraction of Light Rays
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Rods and Cones Rods for B & W vision (120 million) Cones for color vision (6 million) Most in the Fovea
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Image Formation Refraction of Light Rays Accommodation of the Lens Constriction of the Pupil Convergence
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Image Problems Cataracts Age-related macular disease Presbyopia (loss of lens elasticity) Color Blindness Light and dark adaptation
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Hearing and Equilibrium
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Otoliths
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Words to Know CataractsConjuctivitis GlaucomaKeratitis DeafnessOtalgia Meniere’s syndromeTinnitus Otitis mediaVertigo AnosmiaMyopia BlepharitisHypermetropia AstigmatismPresbyopia
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More Words Hyposmia Gustation Taste aversion
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