Sound pathway

Auditory tube

Basilar membrane

Cochlea

Cochlear duct (contains endolymph)

External auditory canal

Helicotrema

Incus

Malleus

Middle ear

Perilymph

Scala tympani

Scala vestibuli

Secondary tympanic membrane vibrating in round window

Sound waves

Spiral organ (organ of Corti)

Stapes vibrating in oval window

Tectorial membrane

Tympanic membrane

Vestibular membrane