ex 25 hearing and equilibrium
Terms
undefined, object
copy deck
- external/outer ear
- composed primalily of auricle and external acoustic meatus
- auricle/pinna
- skin-covered cartilaginus structeure encircling the auditory canal opening.
- lobule
- portion of the pinna lying inferior to the external auditory canal
- external acoustic meatus/ external auditory canal
- short, narrow chamber carved nto the temporal bone- has ceruminous glands in skin-lined walls
- ceruminous glands
- wax-secreting glands in the skin-lined walls of the external acoustic meatus
- tympanic membrane
- eardrum- vibrates at exact same frequency as the sound waves hitting it- separates the external ear from the middle ear
- middle ear
- a small cavity- the tympanic cavity- found w/in the temporal bone
- ossicles
- * malleus, incus, and stapes * articulate to form a lever system that amplifies and transmits the vibratory motion to the inner ear
- oval window
- what the vibratory motion of the eardrum goes through to get to the fluids of the inner ear
- pharyngotympanic/ auditory tube
- the tube connecting the middle ear chamber with the nasopharynx- is normally flat, but swallowing/ yawning causes to open temporarily to equalize the pressure of the mid ear cvity w/ external pressure. can\'t vibrate right unless pressure on both surface are =
- otitis media
- inflammation of the inner ear
- internal ear
- consists of the osseous labyrinth
- osseous labyrinth
- a system of bony chambers filled with perilymph
- perilymph
- acqueous fluid that fills the osseous labyrinth
- membranous labyrinth
- suspended in the perilymph- a system that follows the contours of the osseous labyrinth
- endolymph
- a viscous fluid that fills the membranous labyrinth
- subdivisions of the osseous labyrinth
- vestibule and semicircular canals: for equilibrium and the cochlea
- the cochlea
- division of the osseous labyrinth- snail-like- contains sensory receptors for hearing
- cochlear duct
- soft wormlike tube about 3.8 inches- winds through the full 2 and 3 quarter turns of the the cochlea and separates the cochlear cavity into the scala vestibuli and the scala tympani- filled with endolymph
- scala vestibuli
- the upper chamber of the cochlear chamber
- scala tympani
- lower chamber of the cochlear cavity
- spiral organ of Corti
- contains receptors for hearing: the sensroy hair cells and nerve endings of the cochlear nerve
- cochlear nerve
- a division of the vestibulocochlear nerve VIII
- Basilar Membrane
- where the hair cells rest- forms the floor of the cochlear duct of the Spiral Organ of the Corti
- tectorial membrane
- a gelatinous membrane of the Spiral ORgan of the Corti
- scala media
- endolymph-filled chamber of the cchlear duct
- vestibular apparatus
- the equilibrium apparatus of the inner ear- in the vestibule and semicircular canals of the osseous labyrinth- chambers filled with perilymph in which membranous labyrinth structures are suspended
- vestibule
- one of the structures of the inner ear containin the vestibular apparatus- contains the utricle and saccule
- semicircular apparatus
- one of the structures of the inner ear containing the vestibular apparatus- contains membranous semicircular ducts
- membranous semicircular ducts
- filled with endolymph and contain receptor cells that are activated by the bending of their cilia
- mechanism of dynamic equilibrium
- centrally involve the semicircular canals
- ampulla
- an enlarge region at the base of each semicircular duct- communicates witht he utricle of the vestibule- contains a crista ampullaris
- crista ampullaris
- within an ampulla- a receptor region that consists of a tuft of hair cells covered with a cupula
- cupula
- the gelatinous cap that covers the crista ampularris