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Ear Exam 5
Exam 5 ear
29
Anatomy
Graduate
09/09/2010

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Term
what nerve does the lesser petrosal nerve branch off of?
Definition
- CN IX glossopharyngeal
Term
the middle ear is connected to the ____ aka ____ tube and the ____ ___, that leads to the mastoid air cells.
Definition
- auditory/pharyngotempanic tube
- mastoid antrum
Term
the mastoid air cells are lined with the same ___ that lines the middle ear.
Definition
mucus
Term
the vestibule is a ___ ___ that receives the ends of the ___ canals and contains the ___ and ___.
Definition
- central chamber
- semicircular
- utricle
- saccule
Term
the utricle communicates with the saccule through the _____ duct.
Definition
- utriculosaccular duct
Term
The saccule is continuous with the ___ duct through the __ ____.
Definition
- cochlear duct
- ductus reunions
Term
The utricle and saccule have specialized areas of sensory epithelium called the ____.
Definition
maculae
Term
the maculae of the utricle is in the ___ of the utricle, while the maculae of the saccule is vertical on the ___ wall of the saccule.
Definition
- floor
- medial wall
Term
hair cells in maculae are supplied by what nerve?
Definition
- vestibular part of CN VIII
Term
hair cells in maculae are supplied by what nerve?
Definition
- vestibular part of CN VIII
Term
each semicircular canal has an ampulla at one end. And each ampulla has a sensory area called the ____ ____. This area is a sensor for movements of the ___ when the head is rotated in the plane of the duct.
Definition
- ampullary crest
- endolymph
Term
what contains the round window?
Definition
cochlea
Term
the auditory receptor, the __ __ ___, lies on the ___ membrane and is suspended between what two things?
Definition
- organ of corti
- basilar membrane
- b/w spiral ligament and osseous spiral lamina
Term
The ___ membrane is a gelatinous substance that lies on the apex of hair cells of the organ of corti.
Definition
- Tectorial membrane
Term
tectorial membrane rests of stereocilia of inner and outer hair cells
Definition
Term
all rows of hair cells are adjacent to __ ___ cells.
Definition
outer pillar
Term
each outer hair cell extends a bundle of 50-150 ___ from their ___ surface.
Definition
- stereocilia
- apical
Term
By movement of the basilar membrane and organ of Corti the stereocilia of hair cells become disturbed and depolarization of the hair cells results
Definition
Term
hair cells are suspended by ___ cells, so hair cells do not actually rest on the basilar membrane.
Definition
phalangeal cells
Term
outer and inner pillar cells are tall cells with wide __ and ___ ___. these cells are attached to the ___ ___.
Definition
- bases
- apical ends
- basilar membrane
Term
The ___ tunnel formed by __ and ___ __ cells separates the ___ ___ cells from the ___ __ cells.
Definition
- inner tunnel
- outer and inner pillar cells
- outer hair cells
- inner hair cells
Term
The ___ ___ cells are tall ___ cells that are attached to the __ membrane. these support hair cells.
Definition
- outer phalangeal
- columnar
- basilar
Term
the spiral ganglion is found within the ____.
Definition
- modiolus
Term
processes of the ___ neurons in the spiral ganglion extend into the ___ ___ ___, enter the ___ ___, and synapse in the __ and ___ ___ cells.
Definition
- bipolar
- osseous spiral lamina
- basilar membrane
- inner and outer hair cells
Term
The cochlear nerve is composed of fibers from the spiral ganglion which bifurcate as they enter the cochlear nuclei
Definition
Term
The vestibular nerve arises from bipolar cells in the vestibular ganglion.
Definition
Term
the central fibers of cnVII enter the ____ between the ___ body and spinal tract of the ___ nerve.
Definition
- medulla
- restiform
- trigmeninal (CNV)
Term
Sound waves carried by the external ear are translated into mechanical vibrations of the tympanic membrane.
These vibrations are transferred to the ear ossicles, which in turn generate a wave at the oval window of the cochlea.
Sound waves generated at the oval window are transferred to the scala vestibuli of the cochlea.
The wave passes to the scala tympani via the helicotrema to the round window.
Definition
Term
In the helicotrema, the wave in the perilymph of the scala tympani causes movement of the basilar membrane and organ of Corti.
Definition
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