Abstract
Nonstimulated as well as outer hair cells showing mechanical displacements to electrical and chemical stimulation were examined ultrastructurally to assess the lability of a rhodamine‐labeled actin structure extending between the cuticular plate and the peri‐nuclear region. Hair cells of varying lengths (20–80 μm) were stimulated and immediately fixed following mechanical displacement. All cells revealed a distinct non‐membrane bound complex in cross section, but were infrequently observed in longitudinal sections. The cross‐sectional area of the structure increased in successive ascending sections. This structure spirals apically in a nondirect manner, but eventually consolidates into a primary mass to become contiguous with the inner leaflet of the cells plasmalemma. A localized microtubule network was found to pass most prominantly in the thin basal aspect of the complex. The cross‐sectional orientation appears to optimize the visualization of this potentially important aspect of the outer hair cells anatomy.
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