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tympanic membrane - tympanic membrane(eardrum boundary...

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tympanic membrane (eardrum): boundary between outer & middle ear vibrates with frequency of sound waves entering through external ear; transfers vibration to ossicles of middle ear - middle ear (tympanic cavity): small air-filled cavity within temporal bone lined with mucosa & flanked by the eardrum & 2 openings ( oval (vestibular) window & round (cochlear) window ) the anterior wall of the middle ear contains an opening to the auditory tube (leads to nasopharynx) contains 3 ossicles (small bones) suspended by ligaments: o malleus (hammer) – attaches to eardrum o incus (anvil) o stapes (stirrup) – attaches to oval window of vestibule - inner ear (labyrinth): consists of bony labyrinth & membranous labyrinth bony labyrinth: cavity within the temporal bone filled with perilymph & containing the membranous labyrinth membranous labyrinth: floats in perilymph within bony labyrinth; filled with fluid called endolymph vestibule: central region composed of 2 sacs – the saccule & utricle o
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