We just learned about the Eardrum.
Another part of the ear is the Semicircular Canals.
On the outside of the inner ear are three tubes that go out like circles and then come back to the ear.
These are part of the bony labryinth, and they are what help the body tell which direction the head is moving.
Inside these tubes is some liquid, and at the opening of the tubes are some very tiny hairs.
When you move your head around, the liquid bumps into the hairs, which send signals to the brain telling it that you are moving.
The three semicircular canal tubes go in three different directions so that they can tell whether you are tilting your head, moving up or down, or side to side.
(from: wikipedia - semicircular canals)
Kid Facts - Blast from the past: White Blood Cell
