Transcript Hair cell Cilia

What is your nervous system?
HEARING &
BALANCE
Why do we call our sense of hearing
and balance…..the “hairy” senses?
Cilia
Hair cell
Where are these hair cells?
Semicircular canals
Cochlea
Inner Ear
Middle Ear
External Ear
How do these hair cells work?
Cilia like hair moves….the cilia bend.
When the cilia bends…..
…it pulls on the tip links.
Pulling on the tip links…..
…opens the “door” for chemicals.
Bending the cilia on the hair cells…
…lets the hair cells “talk” to the brain .
What makes the hair cells bend?
First, let’s look at your...
…Auditory System.
Molecules in the air move.
Frequency
Amplitude
The hair cells for the auditory
system...
Cochlea
…are wrapped up in a coil.
Hair cells in different places….
Tectorial
membrane
…bend with different sound frequencies.
So let’s see how it works….
Transduction
The brain then gets the info…
… about the sounds.
Next, let’s look at your...
…Vestibular System.
The hair cells for the vestibular
system...
Semicircular canals
& otolith organs
…are also in the inner ear.
Hair cells in different places….
Rotary
Movement
Linear
Movement
…give different kinds of information.
To make the hair cells bend….
…you have to move!!!
Moving makes the hair cells
bend….
…sending info to the brain.
BUT…only some parts of your brain…
≠
≠
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…get info from your vestibular system.
HEARING &
BALANCE