A thin, skin-like membrane stretched taut across the medial end of the auditory canal. It vibrates in response to sound pressure waves that strikes its surface. Middle An air filled cavity just medial to the tympanic membrane. The Eustachian tube equalises the pressure across the membrane by opening a pathway from the middle ear to the external atmosphere. It is attached medially to the incus.
Carries sound to the stapes.
It rest on a membrane covered opening called the oval window which allows vibrations to enter the inner ear. Convert sound pressure waves to nerve impulses. The tubes contain membrane lined ducts filled with a CSF-like fluid called endolymph. Endolymph conducts sounds pressure waves into the cochlea of the inner ear. Bulbous spaces between the tubes of the semicircular canals and the cochlea.