The ear consists of three parts: 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 consists of two parts: 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.

The ear is located behind the eyes, which has the function of distinguishing vibration, and can convert the sound emitted by vibration into nerve signals, and then transmit them to the brain. In the brain, these signals are translated into words, music and other sounds that we can understand.

Extended data;

Normal people's ears can distinguish about 400 thousand different sounds, some of which are very small, which can only make the eardrum move by one tenth of the diameter of hydrogen molecules. When the sound is emitted, the surrounding air molecules start a series of vibrations. These vibrations are sound waves, which propagate outward from the sound source.

After the sound reaches the external ear, it is introduced into the external auditory canal through the sound collection function of the auricle and reaches the tympanic membrane. The eardrum is the dividing line between the outer ear and the middle ear. It is as thin as paper, but it is strong. When sound waves hit the eardrum, it will cause the eardrum to vibrate. There are thousands of hair cells in the cochlea with tiny cilia at the top.

When the liquid flows, the cilia of these cells are impacted. After a series of bioelectrical changes, hair cells convert sound signals into bioelectrical signals, which are transmitted to the brain through auditory nerves. The brain processes and integrates the transmitted information to produce hearing.

Reference source; Baidu encyclopedia-ear