1. The Senses: Hearing
Auricle collects sound waves
External auditory meatus (canal) channels sound waves
Tympanic mem. & ossicles conduct sound waves

2. The Senses: Hearing
The oval window transfers sound waves to the liquid inside the cochlea
Three scala: vestibuli media (cochlear duct) tympani

3. The Senses: Hearing
Sound waves vibrate basilar membrane causing microvilli to bend
Bending causes depolarization in hair cells that in turn create action potentials in synapsing neurons

4. The Senses: Hearing
Basilar membrane stiff near vestibule, responds to higher frequency sounds (20,000 Hz).
Lower pitches picked up further in to cochlear duct, with lowest frequencies (200 Hz) at apex
Excess wave energy travels back down via scala tympani and out round window

5. The Senses: Balance
Static labyrinth
Responds to force of gravity and linear acceleration

6. The Senses: Balance
Kinetic labyrinth
Responds to movement of endolymph (fluid) in semicircular canals i.e. angular (rotational) acceleration