VI4 - Physiology of Hearing and Equilibrium VI Typical...

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Physiology of Hearing and Equilibrium VI. Typical Hearing Disorders A. conduction deafness - disruption in sound vibrations to basilar membrane (ext & mid ear) 1. blocked auditory canal (wax, fluid) 2. perforated tympanic membrane (eardrum) 3. otitis media - middle ear infection/inflammation 4. otosclerosis - hardening of the earbone joints B. sensorineural deafness - disruption anywhere in pathway from hair cells to the auditory cortex 1. loss of hair cells (explosion, chronic loud noise) 2. damage to vestibulocochlear nerve (VIII) 3. damage to nuclei/tracts to the cortex C. tinnitus - chronic perception of clicking or ringing 1. sudden blow to the tympanic membrane 2. gradual deterioration of afferents in cochlear nerve D. Menierre's Syndrome - effects both hearing and balance; results in tinnitus, vertigo, and interspersed nausea and vomiting 1. may be too much endolymph beneath basilar membrane 2. symptoms can be treated somewhat with drugs 3. endolymph may be drained periodically 4. hearing loss is progressive
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VI4 - Physiology of Hearing and Equilibrium VI Typical...

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