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 auditory meatus, which communicates with the external auditory meatus. The auricle is funnel-shaped and has the function of collecting external sound waves.

The external auditory canal is a curved tube from the hilum of the external ear 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 is located between the eardrum and the inner ear, and it 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 air, and the heat is easy to dissipate. In addition, "the ears are gathered by ancestral veins", and the twelve meridians is familiar with the ears. Therefore, it is necessary to give your ears a warm coat when you go out in winter. You can wear an ear bag or cover your ears with a wide hat scarf; When you enter a warm room from outside, you can quickly rub your ears with your hands to warm them up quickly.