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Senses

Senses. Eyes. http://www.nei.nih.gov/health/eyediagram. Introduction. Sight Hearing Touch Smell Taste. External Features of the Eye. Conjuctiva Eyelids Canthus Medial Lateral Tarsal Glands Ciliary Glands. Lacrimal Apparatus Lacrimal glands Lacrimal canals Nasolacrimal duct

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Senses

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  1. Senses

  2. Eyes • http://www.nei.nih.gov/health/eyediagram

  3. Introduction • Sight • Hearing • Touch • Smell • Taste

  4. External Features of the Eye • Conjuctiva • Eyelids • Canthus • Medial • Lateral • Tarsal Glands • Ciliary Glands

  5. Lacrimal Apparatus • Lacrimal glands • Lacrimal canals • Nasolacrimal duct • Tears • Lysosomes

  6. Eye structure • Sclera – white of the eye • Tough connective tissue • Choroid coat – blood vessels • Retina – intermost part • Sight • Rods & cones

  7. Sclera • Cornea • Iris • Lens • Pupil • Aqueous Humor – Anterior Chamber

  8. Choroid coat • Vitreous Humor – Posterior Chamber • Cilliary Body

  9. Retina • Photoreceptors • Rods • Cones • Neuron chains • Bipolar cells • Ganglion cells • Optic nerve • Optic Disc

  10. Eye Muscles • Pg 274 • Cranial Nerves • III • IV • VI

  11. Eye Diseases • Cataracts • Conjunctivitis • Glaucoma • Hyperopia • Myopia • Macular Degeneration • Presbyopia • Stabismus

  12. EAR • Outer Ear – Auricle to Eardrum • Ceruminous glands produce cerumen • Middle Ear – eardrum to ossicles • Malleus (hammer) • Incus (anvil) • Stapes (stirrup) • Inner Ear – bony labyrinth • Cochlea – organ of Corti • Vestibule – oval window • Semicircular canals – balance & equilibrium

  13. Ear Conditions • Hearing loss • Meniere’s Disease • OtitisExterna • Otitis Media • Otosclerosis

  14. Taste • Tongue - has chemoreceptors • Taste buds • Papillae • Fungiform • Cirmcumvallate • Gustatory cells • Cranial nerves • VII • IX • X

  15. Smell • Chemoreceptors in the nose • Olfactory receptors • Can detect over 6,000 smells • More sensitive than taste • Postage stamp size area located in the superior aspect of the nose • Olfactory receptor cells - neurons on cilia & mucous that travel to Olfactory nerve

  16. Touch • Receptors for: • Heat • Pressure • Light • Deep • Pain

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