June 16, 2016

How We Hear

How We Hear

The ear is made up of three parts:
• Outer Ear
• Middle Ear
• Inner Ear

OUTER EAR
The pinna collects sound waves as they move through the air and directs them into the external ear canal where they are carried directly to the Tympanic Membrane (Eardrum)

MIDDLE EAR
The tympanic membrane vibrates in response to sound waves.
Sound vibrations move from the tympanic membrane through the Ossicles (middle ear bones) to the cochlea.

INNER EAR
Sound vibrations cause the fluid and tiny hair cells inside the cochlea to move.
Neural signals are created by movement of the hair cells and those signals activate the auditory nerve. The auditory nerve signals the auditory cortex of the brain and those signals are interpreted as sounds and speech.