2. Ears include outer ear, middle ear and inner ear. Hearing receptors and position receptors are located in the inner ear, so the ear is also called position hearing device. Some people also list the outer ear and middle ear as appendages of audiometer. The external ear includes auricle and external auditory canal. In addition, there are ear hairs and some glands on the skin of external auditory canal, and the secretions of glands and ear hairs have a certain blocking effect on the entry of foreign bodies such as dust.
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