We all have two ears and use them every day, but do you really know your ears? Through this article, I hope you can understand your ears more deeply. Our ears can be divided into the outer ear, middle ear and inner ear. The outer ear consists of the auricle and the external ear canal. The auricle is made up of the skin on the outside wrapped around the cartilage of the auricle on the inside. The cartilage of the auricle plays the role of the ear’s scaffolding, and it is with its support that our ears are able to have the perfect shape they have now. The shape of the auricle is not static, some people have a more pronounced tilt forward of the auricle, known as the “beckoning ear”; some people have a more prominent auricle on the back edge of the place, known as the “ape ear”; some people have a small auricle-like structure in front of the ear before the ear screen, known as the “secondary auricle”, known as the “secondary auricle”, known as the “secondary auricle”. “secondary auricle”; some people’s overdevelopment of the auricle appears to be very large, known as the “big ear”, Liu Bei in the Three Kingdoms period of the so-called “big ear drooping shoulder”, it may be that this kind of “The outer ear canal starts from the external auditory canal. The external auditory canal starts from the outer ear canal and ends at the tympanic membrane, which is about 2.5~87.5px in length, divided into bone and cartilage. Please note that it is not a “straight tube”, but is slightly “S” shaped. If you want to see deeper into the ear, you need to pull the auricle back and upwards to straighten the curved outer ear canal. The skin of the external auditory canal is thin and tightly packed with cartilage and bone, so when the skin of the canal becomes inflamed, there is no loose tissue to cushion it, and the pain can be severe. The skin of the external auditory canal is lined with ceruminous glands that secrete cerumen, which can accumulate as so-called “earwax”. Our external auditory canal can indirectly encourage cerumen to be removed from the ear through the movement of the mandible, which is the so-called “self-cleaning” function; however, if too much cerumen is not removed in a timely manner, a large black-brown cerumen embolism will be formed, which will block the external auditory canal and affect the hearing. The middle ear includes the tympanic chamber, sinus, mastoid and eustachian tube. We usually know that there is a tympanic membrane in the ear, which is located at the inner end of the external auditory canal and is commonly known as the “eardrum” or “ear mirror”. The tympanic membrane is divided into two parts: the tense part and the loose part, the tense part occupies most of the area of the tympanic membrane, and the loose part is located in the upper part of the tympanic membrane, which is crescent-shaped. The tympanic membrane forms a separation between the external auditory canal and the tympanic chamber, just like the wall between two rooms, the external auditory canal on the outside and the tympanic chamber as the “room” on the inside. The “room” of the tympanic cavity is very small, about 37.5px x 32.5px x 125px in length x width x height. In this narrow cavity, there are many important structures, such as the three auditory ossicles (hammer bone, anvil bone, and stapes bone), muscles, nerves, and so on, and the tympanic cavity is further inward with the opening of the Eustachian tube, which leads to the nasopharynx, just like the sewer in the room. There is an opening for the eustachian tube further inside the tympanic cavity, like a sewer in a room, leading to the nasopharynx. There is a small “doorway” above the back of the tympanic cavity, the “room” behind it is the tympanic sinus, and the “room” behind it is the mastoid process, which is located in the hard bony bump at the back of the auricle, and is composed of many small airspaces. The mastoid is made up of a number of small airspaces, like a honeycomb, each of which varies in size. The function of the structures of the middle ear is mainly for sound. We can imagine the tympanic membrane as a layer of cowhide on the drum, if you hit the drum surface, the vibration of the cowhide can send out a deafening sound, and the tympanic membrane is the opposite, it is to accept sound stimulation, the tympanic membrane due to the sound pressure changes in the vibration triggered by the transfer of energy to the three auditory ossicles composed of the auditory ossicular chain, and then transferred to the inner ear, through the cochlea into electrical signals, through the auditory nerve signal to the brain, so we can hear the sound of the middle ear, and then we can hear the sound of the middle ear. Through the cochlea, the signals are converted into electrical signals and transmitted to the brain by the auditory nerve, so that we can hear and distinguish various kinds of sounds. The inner ear consists of the cochlea, vestibule and semicircular canals. They are located in the side wall of the tympanic cavity inside the bone, as set in the rock inside the fossils of ancient creatures in general, by the hard and incomparable bone protection, in order to get a glimpse of the true face is not easy, and their structure is very complex, so also by medical doctors as “lost” (also divided into bone and membrane labyrinth), if you don’t deeply study it to understand it, it is really easy to “lose” the inner ear. If you do not study it in depth to understand it, it is really easy to “lost”. Their roles are: First, the cochlea of the inner ear, which can convert the mechanical energy of sound into electrical signals and transmit them to the auditory nerve. The vestibule and semicircular canals of the inner ear act as balance receptors, sensing the position and acceleration of the head. As an important part of the hearing receptors, the cochlea of the inner ear can cause sensorineural deafness if it is diseased or damaged. As balance receptors, the vestibular and semicircular canals of the inner ear are like scales hanging on both sides of the head. Normally, they are balanced and equal, but when one side of the receptor is diseased or damaged, it can cause “tilting of the scales” and imbalance of the balance, which can lead to rotational vertigo, nausea, and vomiting. You may wonder why a lesion of the sensory system would cause not only vertigo, but also the digestive symptoms: nausea and vomiting. It is because between the vestibular nerve, which is responsible for the balance of the inner ear, and the autonomic nervous system, which is responsible for the digestive system, there is a “reticular system”, which is like a conductive wire between two power grids, and abnormal discharges from the vestibular nerve can go through the reticular system to stimulate the autonomic nervous system, which triggers nausea and vomiting in the digestive system. Visible, our small ear inside or complex structure, spread all over the organ ah, its sensory function and our healthy life is closely related, we should take good care of their own ears, do not let it before old age. 1998 March, China put forward every year on March 3 as the “National Ear Day”, because of the “3.3”. “The image of “3.3” is just like two ears, and in March 2013, the International Health Organization officially designated our National Ear Care Day as International Ear Care Day. On this day every year, otolaryngologists from all over the world will take to the streets to promote ear care and make their own contribution to the ear health of the world’s people.