Figure 20.26: This gymnast is using the semicircular canals in her ears, along with the
cerebellum in her brain, to help keep her balance on the balance beam. ( 29 )
Figure 20.27: This bottle of water models the semicircular canals in your ears; when you tip
the bottle, the water moves up or down the sides of the bottle; when you tip your head, the
liquid inside the semicircular canals moves up and down the sides of the canals; tiny hair
cells lining the canals detect the movement of liquid and send messages to the brain. ( 21 )