Final answer:
Proprioceptors, eyes, and the vestibular apparatus are important for maintaining balance and equilibrium.
Step-by-step explanation:
The structures that are important to the maintenance of balance and equilibrium are all of the above. Proprioceptors from joints and muscles provide information about body position, eyes help in visual tracking and orientation, and the vestibular apparatus in the inner ear detects changes in head position and movement through fluid-filled organs called the utricle, saccule, and three semicircular canals.