Final answer:
Without a functioning crista ampullaris, the semicircular canals would not function properly.
Step-by-step explanation:
The semicircular canals are part of the vestibular system in the inner ear, which is responsible for maintaining balance and detecting head movements. The canals detect angular acceleration and deceleration through the movement of fluid within them. The canals contain hair cells that respond to rotational movements, and these hair cells send signals to the brain to help perceive changes in head position or movement. Therefore, without a functioning crista ampullaris, which is located within the semicircular canals and contains the hair cells, the canals would not be able to function properly.