In order for sound to reach the spiral organ (of Corti), the auditory ossicles must vibrate the oval window and set the perilymph and endolymph in motion. This statement is true.
The auditory ossicles must shake the oval window and activate the perilymph and endolymph for sound to reach the spiral organ (of Corti). The semicircular ducts wouldn't work if the cristae ampullares weren't functional. The spiral ear organ's hair cells are never regenerated.
One of the two kinds of fluid in the inner ear—the other is endolymph—is perilymph. It encircles the bony labyrinth's membranous labyrinth. Scala vestibuli and scala tympani house the cochlea's internal part.
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