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External Ear

Audiology PowerPoint 3

Auricle an irregularly shaped plate of elastic cartilage
Cerumen ear wax, traps foreign bodies, bacteriostatic
Sebum prevents the skin from drying out
Bacteriostatic prevents bacteria from multiplying (in cerumen)
Tympanic membrane separates external auditory meatus from the middle ear
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.
Function of External Ear funnels sound through the ear canal to the tympanic membrane
As a result of the structure, the auricle and EAM... amplify incoming acoustic pressure and plays the role of an acoustic antenna
Otoscopy visual examination of the aurical, external auditory meatus and tympanic membrane
Microtia congenital deformity of the external ear, varies in severity
Anotia total absence of the auricle
Atresia absence of the EAM
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.
Keloids benign overgrowth of scar tissue that appear at the site of a skin injury. Dense, painful and pruritic (itchy) nodules.
Exostosis surfer's ear, bone under skin develops lumps that grow into the EAM
Carcinoma malignant tumors, looks like peeling scabs
EAM fracture may cause the EAM to collapse, perhaps due to a broken jaw
Tympanosclerosis membrane thickening resulting from chronic inflammation or trauma
Tympanic Membrane Perforation direct trauma. May require tympanoplasty.
Otitis Externa Swimmer's ear. Inflammation of the EAM.
Myringitis infectious disorder resulting in painful blisters on the surface of the tympanic membrane
Created by: 100000299709410



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