The Senses: Hearing Auricle collects sound waves

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Presentation transcript:

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

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

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

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

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

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

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