How Hearing Works
Understanding the journey of sound
Normal Ear Functions
Hearing involves several coordinated steps: sound waves enter the outer ear, vibrate the eardrum, move three tiny middle ear bones, create fluid movement in the inner ear, bend hair cells that convert motion into electrical signals, and transmit those impulses via the auditory nerve to the brain for interpretation.
The Outer Ear
The visible pinna and ear canal work together to amplify sounds in the 2000 to 3000 Hz range where speech consonants occur. The canal is skin-lined with fine hair and receives abundant blood flow. Earwax naturally accumulates as a protective barrier but becomes problematic only if it completely blocks the canal.
The Middle Ear
The eardrum (tympanic membrane) separates the outer and middle ear with a three-layer structure for strength. Three tiny connected bones called ossicles amplify vibrations. The Eustachian tube is the middle ear's air pressure equalizing system that opens through swallowing, yawning, or chewing.
The Inner Ear
Located in the temporal bone, the inner ear contains semicircular canals (for balance) and the cochlea (the hearing organ). The cochlea changes the mechanical vibrations from the tympanic membrane and the ossicles into a sequence of electrical impulses through hair cell bending, encoding frequencies from 20Hz to 20,000Hz.
Protect Your Hearing Health
Understanding how your ears work is the first step in protecting them. Book a hearing assessment to ensure your hearing is at its best.