The structure of the ear is very complex, so here is only a brief introduction. The ear is divided into three parts: the outer ear, the middle ear and the inner ear. Among them, the outer ear is commonly known as the auricle and the external auditory canal. The middle ear is between the outer ear and the inner ear, starting outward at the tympanic membrane and ending inward at the inner ear. The middle ear has an auditory chain, hamate, anvil, and stapes, and a tympanic cavity with a tympanic sinus and mastoid process, which are important parts of hearing conduction, as well as a middle ear with an eustachian tube connected to the nasopharyngeal cavity. The inner ear is divided into three parts: the vestibule, the semicircular canal, and the cochlea. The vestibule and the semicircular canal are responsible for the body’s sense of position and balance, while the cochlea is responsible for hearing, which is transmitted via the auditory nerve to the brain to produce hearing.