Transcript Slide 1

What is your nervous system?
Neurons
HEARING &
BALANCE
Transduction
Got
it!!!
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 neurons .
What makes the hair cells bend?
First, let’s look at your...
…Vestibular System.
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…
≠
≠
≠
…get info from your vestibular system.
Next, 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.
So let’s see how it works….
http://www.youtube.com/watch?
v=IGSKliPSJ7I
So let’s see how it works….
Transduction
The brain then gets the info…
… about the sounds.
HEARING &
BALANCE