The space between the tubules of the membranous labyrinth and the bone is occupied by perilymph , which is in communication via the aqueductus cochleae and aqueductus vestibularis with the meninges and with the CSF of the brain's subarachnoid space . The fluids of the labyrinth are also subject to the gravitational force and that accompanying movement of the head . B. Divisions of the Ear 1. Elastin is present in the flaccid region. The mucosa of the tube and middle ear has several kinds of cell, and defensive systems.
Auditory ossicles articulate with one another - malleus, incus and stapes .
The malleus is vibrated by air moving the tympanic membrane. This movement is then transmitted via the incus to the stapes with its foot held in the oval window by the annular ligament. Elastic membrane of the round window transforms the fluid pressures generated in the inner ear into other forms of energy, thus acting as a pressure-release. Fine nerves pass to them. Although the resulting pressure changes involve all perilymph, the receptors sensitive to the changes are localized in only one part of the labyrinth, the cochlea , and lie in the inner endolymph-filled system.