Final answer:
The three anatomical structures to know in the vestibular system are the utricle, saccule, and the three semicircular canals. These structures are located in the inner ear and are responsible for maintaining balance and equilibrium.
Step-by-step explanation:
The three anatomical structures to know in the vestibular system are the utricle, saccule, and the three semicircular canals (posterior, superior, and horizontal). These structures are located in the inner ear and are responsible for maintaining balance and equilibrium.