Audiology PowerPoint 3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Auricle | an irregularly shaped plate of elastic cartilage
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| Cerumen | ear wax, traps foreign bodies, bacteriostatic
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| Sebum | prevents the skin from drying out
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| Bacteriostatic | prevents bacteria from multiplying (in cerumen)
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| Tympanic membrane | separates external auditory meatus from the middle ear
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| 3 layers of tympanic membrane | Covered on both sides by epithelium. Outer layer thin, cutaneous layer consistent with skin of the EAM. Middle layer tough, fibrous connective tissue.
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| Function of External Ear | funnels sound through the ear canal to the tympanic membrane
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| As a result of the structure, the auricle and EAM... | amplify incoming acoustic pressure and plays the role of an acoustic antenna
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| Otoscopy | visual examination of the aurical, external auditory meatus and tympanic membrane
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| Microtia | congenital deformity of the external ear, varies in severity
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| Anotia | total absence of the auricle
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| Atresia | absence of the EAM
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| Cysts | non-cancerous, closed pockets of tissue that can be filled with fluid (pus). Result of infection, clogging of sebaceous glands or around foreign bodies.
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| Keloids | benign overgrowth of scar tissue that appear at the site of a skin injury. Dense, painful and pruritic (itchy) nodules.
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| Exostosis | surfer's ear, bone under skin develops lumps that grow into the EAM
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| Carcinoma | malignant tumors, looks like peeling scabs
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| EAM fracture | may cause the EAM to collapse, perhaps due to a broken jaw
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| Tympanosclerosis | membrane thickening resulting from chronic inflammation or trauma
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| Tympanic Membrane Perforation | direct trauma. May require tympanoplasty.
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| Otitis Externa | Swimmer's ear. Inflammation of the EAM.
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| Myringitis | infectious disorder resulting in painful blisters on the surface of the tympanic membrane
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