Translocation of the electrode array from scala tympani
to scala vestibuli will not only result in loss of any remaining residual hearing, but it will also result in poorer hearing outcomes with electrical stimulation .
Dexamethasone concentration gradients along scala tympani
after application to the round window membrane.
The basal turn of the cochlea was widely opened, and the fluid at the scala tympani
of the basal turn was maintained only at a level to moisten the BM.
The basal-turn position was characterized by the combination of a diminishing signal in the scala tympani
(caused by the electrode) and a persistent fluid signal in the scala vestibuli.
Our findings demonstrated that mIESCs have the potential to migrate into the injured cochlea because they were found in other scalae (vestibuli and media) in addition to the scala tympani
. Migration from the scala tympani
to vestibuli could be attributable to the flow of perilymph (33).
(8.) Kiefer J, Weber A, Pfennigdorff T, von Ilberg C.: Scala vestibule insertion in cochlear implantation: a valuable alternative for cases with obstructed scala tympani
. ORL J Otorhinolaryngol Relat Spec Sep-Ocl 2000; 62(5):251-6
The model findings were then evaluated in the experimental animal with comparisons of current distributions in the terminal auditory nerve fibers for monopolar as well as bipolar stimulation in the scala tympani
(Figure 5) and between electrodes placed in the scala tympani
and the scala vestibuli.
Microanatomical examination of the temporal bones using micro-computed tomography (CT)  has revealed that the dimensions of the scala tympani
markedly reduce after 450[degrees].
Spots of IBA1+ cells were detected on the undersurface of the basilar membrane in the scala tympani
and the stria vascularis (Figure 1, arrows) and were abundantly present at the endosteal layer of the cochlea, especially at the early postnatal stages (Figure 1, asterisks).
Although they are of equivalent or longer length than the standard electrodes, they travel a greater span of distance since their position is on the outside wall of the scala tympani
. They do not necessarily go farther into the cochlea.
The real mammalian cochlea is compound from three fluid spaces (scala media, scala tympani
and scala vestibuli) which are mutually divided by two membranes (basilar membrane and Reissner's membrane).
Three widely accepted goals for the development of future CI electrode arrays are (1) deeper insertion into the scala tympani
(ST) to access lower frequency cochlear neurons; (2) greater operating efficiency, defined as a reduction in the stimulus charge required to produce a comfortable loudness level; and (3) reduced intracochlear damage associated with surgical insertion.