👉 The term "mastoids" refers to the structures that surround and protect the inner ear in humans. These structures are known as the cochlea, which is responsible for converting sound vibrations into electrical signals that can be detected by the brain. Mastoids are made up of a network of small bones called ossicles, which act as air-filled tubes that allow sound waves to pass through the inner ear and reach the brain. The outer layer of these ossicles is covered in hair or skin, and