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Unformatted text preview: irrup) 4. as sounds vibrate the tympanic membrane, it vibrates the malleus, which vibrates the incus, which vibrates the stapes C. Inner Ear 1. consists of a bony labyrinth with 3 parts a. vestibule i. central part of the labyrinth ii. contains the saccule and utricle iii. the stapes attaches to the oval window on the vestibule's lateral wall iv. the vibrating stapes transmits the vibrations to the vestibule, which transmits them to the cochlea via the cochlear fluid b. cochlea i. attaches to the vestibule ii. houses the spiral­shaped organ of Corti, the receptor organ for hearing iii. cochlear hair cells in the organ of Corti, vibrate as the cochlear fluid vibrates; these vibrations are registered as nerve impulses and sent to the brain via the vestibulocochlear nerve c. semicircular canals i. attaches to the posterior of the vestibule ii. there are 3 tubes, one in each plane (x,y,z) iii. they help with balance and equilibrium D. Ear Problems 1. Deafness ­ any hearing loss, no matter how small a. common deafness i. something prevents the sound vibrations from getting to the inner ear fluid ii. can be caused by: impacted earwax, middle ear inflammation, otosclerosis of the ossicles (ear bones), etc. b. sensorineural deafness i. caused b...
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