The ear includes three parts: the outer ear, the middle ear and the 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.

There is a big hole outside the auricle, called the external auditory meatus, which communicates with the external auditory meatus. The auricle is funnel-shaped and has the function of collecting external sound waves. Most of them are supported by subcutaneous elastic cartilage, and the lower part only contains subcutaneous connective tissue and fat, which is called earlobe. Auricle is the clinical application site of auricular point therapy and auricular acupuncture anesthesia, and earlobe is the commonly used blood collection site in clinic.

Extended data

The outer ear and the middle ear in the human ear are separated by the eardrum, that is, when the eardrum is intact, it acts as a protective barrier, and external objects (whether water, foreign objects or gas, etc. ) will not enter the middle ear to protect the middle ear and inner ear to form a relatively clean environment.

The eardrum is very delicate, and everyone's little habits may hurt it. For example, many people like to "pick out their ears" and even put hairpins and toothpicks in their ears. These are extremely dangerous behaviors. It is easy to cut the ear canal, or cause scratches, and even lead to perforation of the eardrum and dislocation of the ossicles, which will eventually lead to hearing loss, dizziness and tinnitus.

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