scholarly journals Scala vestibuli

2017 ◽  
Author(s):  
Craig Hacking ◽  
Maxime St-Amant
Keyword(s):  
Scala Vestibuli

Na and nonelectrolyte entry into inner ear fluids of the rat

1987 ◽  
Vol 253 (1) ◽  
pp. F50-F58 ◽  
Author(s):  
O. Sterkers ◽  
E. Ferrary ◽  
G. Saumon ◽  
C. Amiel
Keyword(s):  
Cerebrospinal Fluid ◽  
Inner Ear ◽  
Lateral Ventricle ◽  
Endothelial Barrier ◽  
Scala Tympani ◽  
Epithelial Secretion ◽  
Kinetics Of ◽  
Hydrophilic Solutes ◽  
Inner Ear Fluids ◽  
Scala Vestibuli

Kinetics of hydrophilic solute entry into endolymph (EL), perilymph (PL), and cerebrospinal fluid (CSF) were studied after intravenous administration (sodium, urea, glycerol, mannitol, sucrose) and cerebral lateral ventricle injection (urea, sucrose) of tracers in anesthetized rats. Samples of cochlear EL, PL of scala vestibuli (PLV), PL of scala tympani (PLT), and cisternal CSF were obtained. The data showed slow entry of tracers in PLV, PLT, and CSF as follows: Na greater than urea greater than mannitol approximately sucrose; slower entry of mannitol and sucrose in PLT and CSF than in PLV; 1 h delayed peak of radioactivity in PLV compared with the immediate peaks in PLT and CSF after CSF injection, and the value of PLV peak was 13% that in CSF; extremely slow entry of nonelectrolytes in EL. These results indicate that PLV originates mainly from plasma across a blood-perilymph barrier that restricts the entry of small hydrophilic solutes. The blood-perilymph barrier is most likely composed of an endothelial barrier associated with an epithelial secretion. The latter could be located at the vasculo-epithelial zone of the spiral limbus.

K, Cl, and H2O entry in endolymph, perilymph, and cerebrospinal fluid of the rat

1982 ◽  
Vol 243 (2) ◽  
pp. F173-F180 ◽  
Author(s):  
O. Sterkers ◽  
G. Saumon ◽  
P. Tran Ba Huy ◽  
C. Amiel
Keyword(s):  
Cerebrospinal Fluid ◽  
Potassium Chloride ◽  
Intravenous Administration ◽  
Compartmental Analysis ◽  
Water Entry ◽  
Scala Tympani ◽  
Rapid Turnover ◽  
Kinetics Of ◽  
Scala Vestibuli

The kinetics of radioactive potassium, chloride, and water entry into endolymph, perilymph, and cerebrospinal fluid were studied after intravenous administration of tracers in anesthetized and nephrectomized rats. Samples of cochlear endolymph, perilymph of scala vestibuli, perilymph of scala tympani, and cisternal cerebrospinal fluid were obtained. The data showed: 1) a rapid turnover of water in endolymph, perilymph, and cerebrospinal fluid, since 3H2O equilibrated with plasma in a few minutes; 2) a slow entry of 42K and 36Cl in perilymph, since 36Cl equilibrated with plasma after 2 h and 42K did not at 6 h; 3) an extremely slow entry of 42K and 36Cl in endolymph, since no equilibrium with plasma was obtained within the 5 h of the experiments. The comparison of the compartmental analysis of our data with the results of other studies using perilymphatic perfusion of tracers indicated that perilymph rather than plasma may be considered as the precursor of endolymph.

Facilitated transfer of glucose from blood into perilymph in the rat cochlea

1987 ◽  
Vol 253 (1) ◽  
pp. F59-F65 ◽  
Author(s):  
E. Ferrary ◽  
O. Sterkers ◽  
G. Saumon ◽  
P. Tran Ba Huy ◽  
C. Amiel
Keyword(s):  
Cerebrospinal Fluid ◽  
Linear Function ◽  
Intravenous Administration ◽  
Glucose Concentration ◽  
Concentration Ratio ◽  
Facilitated Transport ◽  
Scala Tympani ◽  
Glucose Transfer ◽  
Rat Cochlea ◽  
Scala Vestibuli

The transport of glucose into cochlear endolymph, perilymph of scala vestibuli and perilymph of scala tympani, and cerebrospinal fluid (CSF) was studied after intravenous administration of tracers of D-glucose, L-glucose, and 3-O-methyl-D-glucose in anesthetized rats. The data showed that D-glucose concentrations in perilymph of scala vestibuli, perilymph of scala tympani, and CSF were approximately 50%, and in endolymph less than 10%, that in plasma; D-glucose concentration in perilymph of scala vestibuli, perilymph of scala tympani, and CSF increased as a linear function of that in plasma; D-glucose entry into perilymph of scala vestibuli, perilymph of scala tympani, and CSF was more rapid than that of L-glucose; after infusion of 3-O-methyl-D-glucose, but not after that of mannitol, both the D-glucose concentration ratio of perilymph over plasma and D-glucose transfer into perilymph were lowered. These results indicate that D-glucose enters into perilymph of scala vestibuli by a facilitated transport, possibly located at the blood-perilymph barrier.

scholarly journals Radiologic and Functional Evaluation of Electrode Dislocation from the Scala Tympani to the Scala Vestibuli in Patients with Cochlear Implants

2014 ◽  
Vol 36 (2) ◽  
pp. 372-377 ◽  
Author(s):  
N. Fischer ◽  
L. Pinggera ◽  
V. Weichbold ◽  
D. Dejaco ◽  
J. Schmutzhard ◽  
...  
Keyword(s):  
Cochlear Implants ◽  
Functional Evaluation ◽  
Scala Tympani ◽  
Scala Vestibuli

Dimensions of the scala vestibuli and sectional areas of both scales

1981 ◽  
Vol 233 (1) ◽  
pp. 99-104 ◽  
Author(s):  
M. Zrunek ◽  
M. Lischka
Keyword(s):  
Scala Vestibuli

R441 – 3D Finite Element Model for Perilymphatic Fistula

2008 ◽  
Vol 139 (2_suppl) ◽  
pp. P192-P192
Author(s):  
Ken Hayashi ◽  
Koike Takuji ◽  
Sho Kanzaki ◽  
Kaoru Ogawa
Keyword(s):  
Finite Element ◽  
Hearing Loss ◽  
Clinical Data ◽  
Basilar Membrane ◽  
Maximum Amplitude ◽  
Annular Ligament ◽  
Fe Model ◽  
Low Frequencies ◽  
Air Bubble ◽  
Scala Vestibuli

Problem To investigate the relationship between the intrusion of the air bubble into the scala vestibli and hearing loss at low frequencies. Methods The effect of intrusion of an air bubble into the scala vestibuli on auditory activity was analyzed based on clinical data and using a three-dimensional finite element (FE) model of the human cochlea. The FE model consists of the stapes, the stapedial annular ligament, the oval window, vestibule, lymph, basilar membrane, osseous spiral lamina, and the cochlear aqueduct. An air bubble in the scala vestibuli was modeled as a small fistula opened on the bony wall of the cochlea. The induced vibration of the lymph and the basilar membrane was calculated by changing the position of the air bubble using CFD-ACE software. Results A traversing wave was generated on the basilar membrane of the intact cochlear model by vibrating the stapes. Even if the air bubble existed in the scala vestibuli, the traversing wave was also generated. When the air bubble existed at the second turn of the cochlea, an envelope of the traversing wave had a notch at the portion where the air bubble existed. The ratio of the maximum amplitude of the basilar membrane in the cochlea with the air bubble to that in the intact cochlea decreased with decreasing frequency. The maximum amplitude of the traversing wave in the cochlea with the air bubble was smaller than that in the intact cochlea by 20 dB at 500 Hz. This result is consistent with clinical data. Conclusion Our results suggest that the intrusion of an air bubble into the scala vestibuli causes hearing loss at low frequencies. Significance The removal of air bubbles into the scala vestibli is needed for hearing improvement.

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