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Anatomy
and Physiology of the Ear: A Potential Site of Medical Application
of Synchrotron Radiation
Joseph Roberson, MD
CEO and Medical Director California Ear Institute
at Stanford
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The
human ear utilizes a finely tuned and delicate system of soft tissue
and bone to transfer mechanical energy from the air medium of our
da
ily environment to the fluid filled inner ear. The auditory ossicles
are the smallest bones within the human body are a relatively common
site of disease and dysfunction. Receptor nerve cells (hair cells)
located in the cochlea transform the mechanical energy of the resultant
fluid wave into electrical energy. Hair cells transmit their signals
to second order neurons located in the central core of the cochlea
in the spiral g
anglion. Spiral ganglion cell efferent processes make
up cochlear (or 8th cranial) nerve that synapse in the brainstem at
the cochlear nucleus.
Many of these temporal bone structures have been outside of current
clinical imaging techniques due to their size. Hearing loss is a major
source of disease and disability among our aging population. The purpose
of this presentation is to describe and detail the
peripheral auditory
system with the aim of aiding interpretation of past studies and potential
future medical applications of Synchrotron Radiation.
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