One of the walls of this cavity persists as the tympanic membrane or drum.
The tympanic membrane is derived from the tissue which separates the meatus auditorius externus from the tympanic cavity.
You have not explained the phenomenon; how does that tympanic membrane communicate with the brain?
The chief difficulty is to determine the situation of the tympanic membrane.
If the exostoses be deeply situated, the tympanic membrane may be injured.
The distinct crackle, or clicking sound, is due to the movement of the ear-bones and the tympanic membrane.
It is closed internally by the tympanic membrane, which separates it from the tympanic cavity or middle ear.
Rarely is the outer surface of the tympanic membrane itself involved.
Tinnitus aurium and vertigo are sometimes present, and may be troublesome if the wax rests upon the tympanic membrane.
The wax should never be picked out with pin or sharp object except by a physician, lest injury be done to the tympanic membrane.