Senses of Sight, Hearing, and Equilibrium

Introduction: Where is touch? You may be asking yourself this. Through out most of this section, we discussed touch because that was a big part of the cutaneous receptors. This section concentrates on sight, hearing, and equilibrium. Hearing and equilibrium also work together, using the same instrument, the ear.


Sight:


From http://www.scientificpsychic.com, here is a picture labeling all of the different parts of the eye. The next section is going to explain what some of the different parts play in the sight.

*Very Complicated for vision!

*What Happens

~Light comes in

~Focused by Cornea

~Fine focused by lens

~Pupil lets light in

~Iris controls how much light comes in

~Image formed on the retina that receptors respond to

~Rods and cones are the receptors

~Light changes the shape of the protein of rods and cones, thus stimulating

a response

Hearing:

This picture was obtained from http://www.tchain.com. This also labels the different parts, but we are now looking at the ear. It shows the outside, which gathers the sound, through the path the sound will eventually travel through.

*Very Complicated for the Ear!

*What Happens

~Sound is gathered by the external part of the ear

~The tympanic membrane vibrates

~3 bones (Hammer, anvil, stirrup) carry vibrations to the inner ear

~Fluid vibrates and the membrane gets it, cochlea, and it triggers neurons

Equilibrium:

Equilibrium is a state of balance. It also uses the ear, but the sound takes another path that helps out equilibrium.

*A lot like the Ear

*What Happens

~All the first stuff of the ear

~When the fluid vibrates, it hits little hairs in the ear

~This triggers the neurons and makes one recognize position

Conclusion: That is it! You just spent time looking through the nervous system, different receptors, as well many other aspects that play vital roles in our lives...that we hardly know about! Next up, we will find out we do things completely involuntary. The second major topic of unit three is all about movement!