cochlear duct is the fluid-filled space behind the oval window.
cochlear duct is the fluid-filled space behind the oval window.
what is the fluid-filled space behind the oval window?
cochlear duct
the cochlea (plural is cochleae) is a spiralled, hollow, conical chamber of bone, in which waves propagate from the "base" (near the middle ear and the oval window) to the "apex" (the top or center of the spiral). the spiral canal of the cochlea is a section of the bony labyrinth of the inner ear that is approximately 30 mm long and makes 2¾ turns about the modiolus. the cochlear structures include:









































bullet::::- three "scalae" or chambers:









































bullet::::- the vestibular duct or "scala vestibuli" (containing perilymph), which lies superior to the cochlear duct and abuts the oval window
cochlea
oval window









































the oval window (or fenestra vestibuli) is a membrane-covered opening that leads from the middle ear to the vestibule of the inner ear.









































vibrations that contact the tympanic membrane travel through the three ossicles and into the inner ear. the oval window is the intersection of the middle ear with the inner ear and is directly contacted by the stapes; by the time vibrations reach the oval window, they have been amplified over 10 times from what they were when they contacted the tympanic membrane, a testament to the amplifying power of the middle ear.
oval window