Middle Ear
the middle ear is an air-fill chamber with three bones,( the ossicles),connecting the tympanic membrane to the oval
window .eustachian tube connecting the tympanic membrane to equalise.
Sudden changes on both sides of the tympanic
membrane to equalise .sudden changes
in pressure , as in the landing or taking oof of an aeroplane,may cause pain and even rupture the tympanic membrane matching the middle ear serves an important function of matching impedances of sound waves in two media: air ,in the outer
ear and a denser fluid in the inner ear.