The ear (auditory) canal in humans: photos, length and structure
And what is the auditory canal of a person?
The ear is a complex vestibular-auditory organ that picks up sound waves and converts them into electrical nerve impulses. The anatomical structure of the organ of hearing is complex, but the technique of its operation is very simple.
The hearing aid is located inside the temporal bone of the skull, which is considered the most solid in the body. To see the full structure of the body, as the ear canal is too deep. In the article we consider in detail the features of the internal auditory canal on the photo.
The anatomical structure of the organ of hearing
Arranged right ear will directly affect the quality of hearing. A hearing aid is divided into the following components:
- The outer ear.
- Middle ear.
- Inner ear.
All of the elements of the ear have their own characteristics and are closely related to each other. When the auricle or ear canal in humans are damaged, the impulses to the nervous system are distorted.
The structure of the outer ear
This Department ear only receives incoming audio streams and assigns them to other agencies. It starts with the ear. She is a receiver of vibrations and frequencies. Shell — dense elastic cartilage, protected skin.
This element of the organ of hearing is able to perceive signals at a distance of twenty meters. Due to the presence of folds is processed distorted sound frequencies, before the creation of three-dimensional stereo sound in the ear canal.
The auricle is connected with the auditory passage of the ear, then the cartilage where the passage is converted into bone, and its surface shell goes into the mucosa. All he has is excellent, slightly curved shape, the similarity is only in the narrowing of going down to the eardrum.
Near the bottom of the membrane, the ear canal of the person in the photo below it can be seen, just wrap that enables avoidance of stimuli into the ear. Along with this, in the beginning of the passage has sulphur gland responsible for the secretion of the sebaceous and sulfuric secret. The data highlight moisturize the epithelium of the canal and protect it from germs and foreign particles.
The release rate of earwax every person is different. When it is excessive accumulation of cerumen occurs, which contributes to hearing loss. How to get rid of cerumen can be found here. Next is the membrane that separates the outer ear from the middle.
On top of it is covered by the tissue, and internally of mucous membrane. Typically, this connective tissue plate is thick somewhere 0.1 mm, and a diameter of 9 mm. It is very sensitive and after the return signal has the initial position for 0.005 seconds. Having a strong structure, it is able to withstand a pressure significantly above atmospheric.
The structure of the middle ear
This range of hearing is from the tympanic cavity, which tightly adjoins the membrane. The cavity is equal to 1 CC It is a flattened, elongated space containing air. It has a number of movably fastened small stones. This structure transfers the waves from the tympanic membrane deep into the system.
Because of its shape, the auditory ossicles are called the hammer, anvil and stirrup. When the ear receives the sound frequency, they go through the eardrum to the hammer. Further, by using the anvil waves are transferred to the stapes and then go further into the body.
Over the drum camera is the mastoid process with small wire mesh, pneumatic structure. The upper cavity contains the mouth of the Eustachian tube with a size of 35 mm, thanks to it, communication between the drum chamber and nasopharynx.
The function of the pipe in the pressure equalization on both sides of the eardrum. The opening of the pipe and run the air takes place during mastication, swallowing, throat. Inside it is covered with cilia, which have a drainage function.
When you change the outside pressure, may occur the phenomenon of «laying the ears.» The problem is solved reflex emerging yawn. To get rid of this reaction is possible after a few swallowing movements.
The structure of the ear canal to the inner ear
The internal auditory canal is located in the inner ear Department the system. It begins in the rocky section and ends in other structures of the body, like a bottom of the passage. The canal itself is cut obliquely, it gives it an oval shape.
It acts as a connector of the ear and brain. Its diameter is about 5 mm, and the length of the auditory canal is relatively small – 12 mm. it Comes out at the cerebellopontine angle.
Channel is via the vestibulocochlear nerve. And close to the inner channel is located the vestibular apparatus and the auditory nerve. The main function of the inner channel to transmit sound frequencies to the brain through nerve terminals.
The very same bone of the inner ear has many chambers and passages, which are referred to as labyrinth. He himself is divided into two areas – bone and the membranous labyrinth. To the first part, multiple compartments, available in dense temporal bone. Also, this area is divided into semicircular canals, vestibule and cochlea.
The threshold has two opening: one hidden behind the stapes, the other similar to eardrum. Snail also plays a crucial role during the transformation of frequencies in a sound. The structure is a spiral swirl from channel to 2.75 turnover. Height she is 5 mm, and length – 3.2 cm it is the membranous labyrinth filled with Andolini.
Between it and the bony labyrinth there is a place with perilymph. This division is also differentiated into three sections. One identical in configuration to the three semicircular canals. Other parts of the bone threshold on two structures: the utricle and the saccule. The next Department is the spiral channel, copying the shape of a snail.
The helical structure has membrane, which contains receptor cells and the epithelial membrane. The basic need in the role of the delimiter of the membranous labyrinth. It consists of different fiber length, going across a turn of the cochlea.
Semicircular canals provide good coordination. There are 6, 3 in each ear on. They are all a similar structure, originate and end at the utricle. Inside each is a channel, repeating exactly the curve. At the end of all of the channels there is an increase in the vial. Inside each channel contains andolina, as well as in the sacs of the vestibule.
In addition, the bags contain many receptors of the hair shape and velkovich stones. It works like this, when a person changes body position, the fluid in the canals moves the stones and irritate the receptors. Further, the irritation goes on the vestibular nerve, and from there the signal goes to the brain.
On this basis, we can say that the human ear is a fairly complex system consisting of many entities. Knowing its structure it is possible to understand the essence of his mission.
This indispensable organ of the human body requires constant attention. Lack of hygiene may serve the development of serious pathology. To prevent the negative scenario of development abnormalities, periodically do preventive massage and medical examination.