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Auditory System
Auditory System
51
Anatomy
Graduate
03/24/2015

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Term
The cochlea makes 2 3/4 turns around a central core of spongy bone called what?
Definition
modiolus
Term
the cochlea and semicircular canals are embedded bone known as what
Definition
bony labyrinth
Term
what is contained within the bony labyrinth
Definition
membranous labyrinth
Term
the membranous labyrinth contains what
Definition
neural components for hearing and balance
Term
what are the neural components for hearling and balance
Definition
cochlea and semicircular canals
Term
the cochlear canal is divided into 3 compartments, what are they
Definition
cochlear duct (scala media), scala vestibuli, scala tympani
Term
scala media aka
Definition
cochlear duct
Term
the scala vestibuli is lined by what
Definition
vestibular membrane
Term
the scala tympani is lined by what
Definition
basilar membrane
Term
the cochlear duct, scala vestibuli, and scala tympani together represent what of the cochlea
Definition
lumen of the membranous labyrinth
Term
what lies between teh vestibular and basilar membranes
Definition
cochlear duct
Term
the cochlear duct is separated from the scala vestibuli by what
Definition
vestibular membrane
Term
the cochlear duct is separated from the scala tympani by what
Definition
basilar membrane
Term
the scala vestibuli and tympani are filled with what
Definition
perilymph
Term
the cochlear duct is filled with what
Definition
endolymph
Term
endolymph is found in the cochlear duct and where else
Definition
vestibular semicircular canals
Term
where does the scala vestibuli begin
Definition
oval window
Term
the oval window is associated with what
Definition
auditory ossicles of the middle ear and tympanic membrane
Term
the scala tympani ends where
Definition
round window
Term
the scala vestibuli and tympani communicate with each other through what
Definition
helicotrema
Term
where is the helicotrema located
Definition
apex of the cochlea
Term
sound travels through the external auditory meatus and what happens as a result
Definition
movement of the tympanic membrane
Term
movement of the tympanic membrane results in what?
Definition
movement of the ossicles
Term
movement of the ossicles results in what
Definition
vibration of the oval window
Term
vibration of the oval window results in what
Definition
vibrations in the perilymph of the scala vestibuli
Term
what are the 3 ossicles of the ear in order?
Definition
malleus, incus, stapes
Term
how does sound reach the tympanic membrane
Definition
via the external auditory meatus
Term
the organ of corti rests where
Definition
basilar membrane
Term
the organ or corti consists of sensory hair cells and supporting cells, how are the hair cells distinguished?
Definition
row of inner and outer hair cells
Term
the hair cells of the organ of corti are embedded in what
Definition
tectorial membrane
Term
movement of what causes distortion of the stereocilia causing them to generate generator potentials
Definition
basilar membrane
Term
movement of the basilar membrane in the organ of corti results in what
Definition
stereocilia generating generator potentials
Term
hair cells are associated with a network of cochlear axons, the cell bodies of which comprise what
Definition
cochlear (spiral) ganglion
Term
the fibers from the spiral ganglion form what
Definition
cochlear division of CN VIII
Term
CN VIII enters where
Definition
bulbopontine sulcus
Term
auditory fibers from CN VIII synapse on what type of neurons?
Definition
second order neurons
Term
auditory fibers from CN VIII synapse on second order neurons located where (2) and on what side?
Definition
ipsilateral ventral and dorsal cochlear nuclei
Term
Second order neurons located in the ventral and dorsal cochlear nuclei project how
Definition
bilaterally
Term
second order neurons located in the ventral and dorsal cochlear nuclei project bilaterally and ascend via what
Definition
lateral lemniscus
Term
second order fibers that decussate do so where
Definition
trapezoid body
Term
as lateral lemniscus fibers ascend the brainstem they may or may not synapse where (2)
Definition
superior olivary nucleus, nucleus of the lateral lemniscus
Term
in the midbrain the lateral lemniscus spread out to and envelop and synapse in what structure
Definition
inferior colliculus
Term
at what level do some fibers from teh contralateral side cross back to the other side
Definition
level of the inferior colliculi
Term
when fibers from the contralateral side cross back to the other side at the level of teh inferior colliculi, what does this do?
Definition
increase bilateral representation of auditory input
Term
fibers from the inferior colliculus course through what?
Definition
brachium of the inferior colliculus
Term
fibers from the inferior colliculus course through the brachium of the inferior colliculus and synapse where
Definition
medial geniculate body
Term
fibers exit the medial geniculate body as what
Definition
auditory radiations
Term
auditory radiation fibers join what
Definition
internal capsule
Term
fibers that have joined the internal capsule end where (generally)
Definition
superior temporal gyrus
Term
fibers that have joined the internal capsule end where (specifically)
Definition
transverse gyri of heschl/primary auditory cortex
Term
information from ipsilateral ventral and dorsal cochlear nuclei projects how and where
Definition
bilaterally to lateral lemniscus
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