Histological studies assessing scala dimensions and morphology [15, 16] show that the height of the scala tympani
, specifically the height at the lateral aspect of the scala tympani
, begins to reduce significantly beyond 360[degrees] to 450[degrees].
Demonstration of a longitudinal concentration gradient along scala tympani
by sequential sampling of perilymph from the cochlear apex.
A recent case series of cochlear implantation in CS revealed that half of these patients had ossification of the scala tympani
during surgery (6 of 12 patients).
During the experiment, the piezo stimulator was advanced in about a 60-degree (relative to the horizon) angle by the micromanipulator into the opened scala tympani
and to get contact with the BM by the tip.
MRI scans of the cochlea offer the opportunity to differentiate between the scala vestibuli and the scala tympani
. This observation is routinely used in evaluations before cochlear implantations to estimate the patency of the cochlea for the electrode, to plan the surgical access, or to exclude intracochlear schwannoma (which presents as diminishing of the fluid signal in the T2-weighted sequence).
The localization of the cells was examined in the scala tympani
and elsewhere in the cochlea.
When an electric current is routed to an intracochlear electrode, an impulse generated to the nerves in scala tympani
and then directly to the brain through the auditory nerve system.
The most frequent site of ossification is the basal turn of the scala tympani
The implant is a neural stimulator with an electrode array surgically placed near the auditory nerve fibers in the scala tympani
of the cochlea.
The three fluid spaces (scala media, scala tympani
and scala vestibuli) are separated by the two membranes (basilar membrane and Reissners membrane).
first focused their research on inserting a molded electrode array in the scala tympani
to fill the space [33-34], thus limiting the spread of current around it.
Asymmetric stiffness to limit the vertical movement of the array in the scala tympani
is a prominent feature of the design of both the electrodes.