The ear includes three parts: the outer ear, the middle ear and the inner ear, and the outer ear includes two parts: the auricle and the external auditory canal. There is a big hole outside the auricle, called the external ear door, which connects with the external auditory canal. The auricle is funnel-shaped and has the function of collecting external sound waves.

The external auditory canal is a curved tube from the external auditory door to the tympanic membrane, about 2.5～3.5 cm long, and its skin continues from the auricle. The outer third of the external auditory canal wall is composed of cartilage, and the inner two thirds of the external auditory canal wall is composed of bone. The tympanum, located between the eardrum and the inner ear, is a small cavity containing gas with a volume of about 1 cm3. The tympanum is the main part of the middle ear.

Extended data

Ear is one of the important organs of the five senses, 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. It not only controls hearing, but also has the function of keeping the body balanced.

Although the ear is small in size, it has a large contact area with the air, and the heat is easy to dissipate. Besides, "the ear is gathered by the ancestral veins" and the twelve meridians passes through the ear. Therefore, it is necessary to give the ear a warm coat when going out in winter. You can wear ear bags, or cover your ears with a wide hat and scarf; When you enter the warm room from the outdoor, you can quickly rub your ears with your hands to make them warm up quickly.