20demayo Chapter 467 Ears
Chapter 467 Ears
Chapter 467 Ears
The sun has risen, and the Phoenix Goddess has slept through the night.
Although Goddess Phoenix is a goddess, she is also a woman.No woman will stay up all night, otherwise the skin on the face will be wrinkled.
Erwa fell asleep soundly and slept soundly all night.When he woke up, the sun had already hit his face!
"It's so comfortable!"
Erwa stretched his waist, he was very comfortable.
Maybe it was the spiritual power given by the Phoenix Goddess last night, which made Erwa's body full of strength now!
Phoenix Goddess smiled and said, "You're awake, there's a lot of hearty breakfast here. After breakfast, we can train our ears."
Buns, steamed buns, porridge, noodles.
There are many kinds of breakfast, Erwa can only eat enough, he is not picky.
The Phoenix Goddess is waiting for Erwa at the pavilion by the river.
After a full meal, Erwa came to the pavilion where the Phoenix Goddess was waiting for him.
"Goddess Phoenix, what do you want to tell me about my ears today?"
ear includes outer ear and inner ear
External auditory canal: about 2.5-3.5 cm long, composed of cartilage and bone. The cartilage accounts for about 1/3 of the external auditory canal. There are two narrow places in the external auditory canal. One is the junction of the bone and cartilage, and the other is the distance between the bone and the tympanic membrane. At 0.5 cm, the latter is called the gorge of the external auditory canal, and the external auditory canal is curved in an S shape.There is very little subcutaneous tissue in the external auditory canal, and the skin is almost in contact with the perichondrium and periosteum. Therefore, when the infection swells, the nerve endings are easily compressed and cause severe pain. The skin of the cartilage contains cerumen glands similar to sweat glands, which can secrete cerumen and are rich in Hair follicles and sebaceous glands.
Nerves and blood vessels of the external auditory canal: one is the auricular temporal branch of the mandibular nerve, which is distributed in the front half of the external auditory canal, so it can be transmitted to the external auditory canal when dental disease and other pain occur; the other is the auricular branch of the vagus nerve, which is distributed in the latter half of the external auditory canal, etc. Therefore, when it stimulates the skin of the external auditory canal, it can cause reflex cough, and the greater auricular nerve and lesser occipital nerve from the cervical plexus.
Tympanic cavity: The tympanic cavity is an air-filled chamber that sits between the eardrum and the outer wall of the inner ear.There are ossicles, muscles and ligaments in the tympanic cavity, and the cavity is covered by mucous membrane.The outer wall of the tympanic membrane is the tympanic membrane.
Eustachian tube: the tube that communicates the tympanic cavity with the nasopharynx. The total length of an adult is about 35 mm.The outer 1/3 is the bony part and the inner 2/3 is the cartilaginous part. The pharyngeal opening at the medial end is located on the side wall of the nasopharynx, which is suitable for the back and lower part of the posterior end of the inferior turbinate. It is close to the level, and the lumen is short and the inner diameter is wide, so it is easier for children's pharyngeal infection to enter the tympanic cavity through this tube.
The outer ear consists of the ear shell and auditory tube.The human ear shell cannot rotate, and it is not as effective as other mammals in terms of identifying the direction of sound and collecting sound waves (mammals can usually rotate the ear shell to collect sound).There are secretions of fat glands in the auditory tube, and the inner layer of the tube wall is hairy, both of which can prevent foreign objects from entering the ear.
There is a thin membrane at the junction of the middle ear and the auditory tube, called the tympanic membrane, and the sound waves from the outer ear can vibrate the tympanic membrane.The middle ear is a small cavity, and there are three small bones across the middle ear cavity. The three bones are malleus, incus, and stapes in order, which connect with each other back and forth.After the sound waves from the outer ear are converted into vibrations by the eardrum, they can be transmitted to the inner ear through the three small bones.There is air in the middle ear cavity, and there is a Eustachian tube below it that communicates with the pharynx. The tube that communicates with the pharynx is usually closed, but it opens when chewing or swallowing, allowing air to enter the middle ear to balance the air pressure on both sides of the tympanic membrane. Protect the eardrum from damage.The closure of the Eustachian tube can block one's own voice from entering the ear directly through the Eustachian tube from the throat, otherwise the sound waves will damage the internal structure of the ear.If bacteria enter the middle ear from the Eustachian tube, it will cause otitis media.
There is also a membrane at the junction of the inner ear and the middle ear, and the stapes in the middle ear are connected to this membrane.The inner ear is a complex and tortuous pipeline, so it is also called the labyrinth.The duct is divided into the cochlea, vestibule, and three semicircular canals, which are filled with lymph.The cochlea is associated with hearing, and the vestibular and semicircular canals are associated with balance.There are auditory receptors in the cochlea. The vibration of sound waves from the middle ear will vibrate the lymph in the cochlea, and then stimulate the auditory receptors to generate impulses, which are then transmitted to the auditory center of the cerebral cortex through the auditory nerve to produce hearing.
The three semicircular canals are perpendicular to each other and are located on three different planes. Regardless of the head turning in any direction, at least one of the semicircular canals will be stimulated by lymphatic vibrations to generate impulses, which will be transmitted from the auditory nerve to the brain, and there will be head turning Feeling, this is the sense of balance.Humans are used to activities on a flat surface. If the body moves up and down, such as when sailing on a bumpy sea, the semicircular canals are stimulated unusually, and people will feel seasick.
The aforementioned semicircular canal produces a sense of balance when the head is turned, which is a dynamic sense of balance; while the vestibule produces a sense of head position when the head is still, which is a static sense of balance, for example, if a person turns his head down Inverted, that is, to stimulate the vestibule, so that the impulse is transmitted to the brain, and there will be a feeling that the head position is different from usual.
To understand how the ear hears sound, we must first talk about what sound is.
Sound is actually a kind of air fluctuation that is produced by the vibration of objects and can spread around.Just like water waves, when a stone is thrown into a calm lake, ripples will be generated on the water surface and spread around.And the material that the sound waves fluctuate is not water.
Invisible, intangible air.Sound waves have energy, and they can vibrate the objects they touch, just as water waves can shake objects on the water surface.
After hearing so much knowledge about ears, Erwa said, "Then how can I improve my ears?"
The Phoenix Goddess smiled and said: "It's very simple, wait a minute and I will say a word in the torrential river, and see if you can hear what I said."
Erwa nodded.
The noise of the surging river ahead is the biggest obstacle to stop Erwa.
Goddess Phoenix floated on the river, she looked at the surging river and said a word!
This sentence is quite satisfactory, without making a small voice or amplifying the voice.When she comes back, I hope Erwa can repeat what she said.But Erwa regretfully told Phoenix Goddess that he didn't hear!
Goddess Phoenix knew the result, after all Erwa couldn't hear it all at once.
So Phoenix Goddess smiled and said, "There are two ways to increase the strength of Shunfenger for reference only."
Erwa asked anxiously, "What way?"
Phoenix Goddess smiled and said: "The first method is the same as the improvement of clairvoyance. First, overcome the noise, and then the first, second, and third steps improve your ability to listen to the wind. This method is very effective, but you also know that it is not Things that can be done overnight. The second way is to learn lip language! As long as you can understand what lip language is saying, and use vision to represent hearing. There is no problem!"
Erwa nodded: "I choose the second one!"
(End of this chapter)