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The Ear, Contains auditory ossicles: -malleus -incus -stapes -vibrations from drum to oval window Middle Ear Infections (Otitis media) -improper drainage in kids -inflamm. middle ear -upper resp infection spreads via Eus tube -allev. w/ elongation of Eus tube to drain if chronic, cause hearing loss, Sensorineural-can be congenital infections chronic excessive noise ???? Presbycusis-sensorineural result of aging loss of sensory hair cells/nerves -begins in basal turn of cochlea -thus lose high freq hearing lost first, Inner Ear 2 labyrinths Bony Labyrinth -filled w/ perilymph-↑Na,↓K -w/in petrous portion of temp. bone -contains cochlea, canals, recesses oval window, Inner Ear 2 labyrinths Membranous Labyrinth -filled w/ endolymph-↓Na,↑K -formed from otic placode/vesic -ectodermal epith -spec. epith to detect mvmt -with ducts-tubes, Middle Ear i -irreg. shaped w/in temporal bone -connects to pharynx via Eustac. tube -to equalize env. pressures -to posterior air-cell cavity of mastoid proc. -simple squam epith lining, Pinna(auricle)-core of elastic cartilage -for auditory localization -tight skin w/ hair, seb.&sweat gll. ???? External Auditory Meatus -flattened tube from pinna -into temporal bone -lined by skin-hair, seb&ceruminous gll., Cochlea-3 spaces 1. Scala vestibuli-above -filled w/ perilymph -opens at oval window --Vestibular (Reissner's) memb-- 2. S. media-cochlear duct -filled w/ endolymph ----Basilar Membrane---- 3. S. tympani-below coch. duct -filled w/ perilymph -opens at round window ???? Hearing Loss, Cochlea-3 spaces 1. Scala vestibuli-above -filled w/ perilymph -opens at oval window --Vestibular (Reissner's) memb-- 2. S. media-cochlear duct -filled w/ endolymph ----Basilar Membrane---- 3. S. tympani-below coch. duct -filled w/ perilymph -opens at round window ???? Helicotrema-apex of cochlea communication point for -s. vestibuli -s. tympani, The Ear ???? External Ear, External Auditory Meatus -flattened tube from pinna -into temporal bone -lined by skin-hair, seb&ceruminous gll. ???? Tympanic membrane-eardrum -covers end of EAM -outer layer-thin epidermis -core-tough elastic CT-fibroblasts->coll. -inner-simple cub. epith. -ant. upper 1/4-thinner, flaccid-Shrapnell's memb