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76 Cards in this Set
- Front
- Back
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What are the three sections of the inner ear?
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semicircular canals, vestibule, cochlea
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What are the two labyrinthine systems of the inner ear?
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osseous labyrinth
membranous labyrinth |
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What is the system of canals and cavities in the petrous portion of the temporal bone?
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Osseus Labryinth
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The ________ portion of the Osseus Labryinth contains the hardest bone in the body.
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petrous
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The petrous portion of the Osseus Labryinth contains the __________ bone in the body
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hardest
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The _________ forms the central portion of the osseus labryinth
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vestibule
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________________ lie posterior to Vestibule in the osseus labryinth.
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semicircular canals
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The semicircular canals lie __________ to the vestibule in the osseus labryinth
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posterior
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The semicircular canals lie posterior to the __________ in the osseus labryinth
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vestibule
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__________ lies anterior and slightly inferior to Vestibule
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cochlea
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Cochlea lies __________ and slightly __________ to Vestibule
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anterior, inferior
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Two structures concerned with balance that the vestibule houses
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utricle
saccule |
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The utricle and saccule contain sensory epithelia that are responsive for _______________ and _____________________
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linear acceleration (locomotion), effects of gravity (head and body tilt)
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What are the 3 semicircular canals (right angle)?
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Superior (anterior)
Posterior Lateral (horizontal) |
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Semicircular canals open into vestibule via 5 openings called _____________
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ampulla(e)
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Ampullae contain sensory receptors for ________________ ______________
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rotational acceleration
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Medial portion of bony labyrinth is the ____________
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cochlea
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Cochlea is where ______________ portion of the ear is housed
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auditory
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The ___________ is where auditory portion of the ear is housed
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cochlea
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The name for this structure is derived from the fact that it is a snail-coiled canal (in humans 2 ¾ turns).
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Cochlea
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Cochlea is twisted around a central core pillar of bone called the __________
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modiolus
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What is the modiolus?
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The central core pillar of bone that the cochlea wraps around.
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The upper duct of the cochlea
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scala vestibuli
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The lower duct of the cochlea
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scala tympani
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________ fills the scala tympani and the scala vestibuli of the cochlea
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Perilymph
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There is another duct (the cochlear duct) interpositioned between these scala vestibuli and scala tympani. This duct is part of the _________________ labyrinth
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membranous
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What is the tiny opening near the apex which permits communication between the scala vestibuli and the scala tympani?
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helicotrema
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What is the function of the helicotrema?
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Permits communication between the scala vestibuli and the scala tympani
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What is the labryinth that is contained within the osseus labryinth that resembles the shape of the osseus labryinth?
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Membranous Labryrinth
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Membranous labyrinth (3 semicircular canals, cochlear duct, the saccule and the utricle) is filled with ____________
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endolymph
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Where is membranous labyrinth found?
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In the 3 semi-circular canals, saccule and utricle, and the cochlear duct
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What are the other names for the cochlear duct?
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cochlear partition or scala media
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What are the three chambers of the cochlea?
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Scala vestibuli
Scala tympani Cochlear duct/cochlear partition/scala media |
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The cochlear duct attaches to the outer wall of the cochlea by means of the _________________
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spiral ligament
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What does the spiral ligament attach?
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The cochlear duct to the outer wall of the cochlea
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What does the Reissner's Membrane separate?
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The cochlear duct from the scala vestibuli
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Reissner’s Membrane extends from the ____________ to the _____________
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spiral lamina, outer wall of cochlear
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The basilar membrane separates the __________ from the ___________
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cochlear duct, scala tympani
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The basilar membrane extends from the ________ to the _______________
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osseus spiral lamina, spiral ligament on the scala tympani side
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Describe the width of the Basilar membrane
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narrower and stiffer at base, and broader at apex
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What are the two parts of the basilar membrane?
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zona arcuata and zona pectinata
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The part of the basilar membrane that is thin and extends from spiral lamina to outer pillars
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zona arcuata
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The part of the basilar membrane that is thicker and extends to the spiral ligament
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zona pectinata
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Structure that partially divides the scala vestibuli and scala tympani
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Osseus spiral lamina
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The osseus spiral lamina is two thin sheets of bone through which the __________ courses
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auditory nerve (cn VIII)
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There are tiny openings at the edge of the osseous spiral lamina that allow the auditory nerve fibers to enter into the ____________
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Organ of Corti
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A thickening of periosteum
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spiral limbus
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The spiral limbus is continuous with and sitting on top of the ___________
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spiral lamina
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What does the Reissner's membrane attach to?
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The top of the spiral limbus
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What is the “C” pattern formed by the spiral limbus?
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internal spiral sulcus
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The spiral limbus is _________ at its outer part
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concave
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What is the structure that sits on top of the basilar membrane?
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Organ of Corti
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The Organ of Corti is also known as the _______________
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Sense organ of hearing
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What are the sensory cells of the organ of corti called?
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hair cells
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What are the supporting cells of the Organ of Corti?
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pillars (rods) of Corti, inner sulcus cells, phalangeal cells, Deiters’ cells, Henson cells, Claudius cells
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What name is hair cell derived from?
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stereocilia
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What are stereocilia?
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hair like projections at top of cell
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What are the two types of hair cells?
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inner hair cells
outer hair cells |
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The saccule and utricle are part of the ______
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vestibule
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The utricle and the saccule aid in _____________
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balance
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What is the scala vestibuli?
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The upper duct of the cochlea
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What is the ampulla(e)?
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Openings that allow the 3 semicircular canals to open into the vestibule.
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What is the scala tympani?
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The lower duct of the cochlea
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What does perilymph fill?
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The chambers of the cochlea.
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What does endolymph fill?
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The membranous labyrinth.
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What is the zona arcuata?
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The part of the basilar membrane that is thin and extends from spiral lamina to outer pillars
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What is the zona pectinata?
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The part of the basilar membrane that is thicker and extends to the spiral ligament
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What is the osseus spiral lamina?
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Structure that partially divides the scala vestibuli and scala tympani
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What is the internal spiral sulcus?
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The “C” pattern formed by the spiral limbus.
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A single row of hair cells located on the inner side of pillar (rods) of Corti
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Inner hair cells
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Where are inner hair cells located?
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on the inner side of pillar (rods) of Corti
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Approximately how many inner hair cells exist?
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3500
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What shape are inner hair cells?
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flask-shaped
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Which cells provide support to the inner hair cells?
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(Supported by) cup shaped phalangeal cells, (with additional support from) inner sulcus cells
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Each inner hair cell contains _______________________.
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stereocilia (sensory receptors)
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Stereocilia form almost a straight line along____________
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Organ of Corti
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