Final answer:
The hair cells in each macula are embedded in the otolithic membrane which contains otoliths.
Step-by-step explanation:
The hair cells in each macula are embedded in the otolithic membrane, a gelatinous material containing small grains of calcium carbonate (otoliths). The otolithic membrane is located in the utricle and saccule of the inner ear. When the head tilts, the otolithic membrane slides over the macula, bending the hair cells and causing a depolarization or hyperpolarization response.