Without the lacrimal glands, wouldn t there be tears?

Tears come from the lacrimal glands. The lacrimal gland is made up of thin tubular glands and ducts, and it is the organ that secretes tears. The lacrimal gland is located in the lacrimal gland fossa above the outer orbit and is divided into two parts: upper and lower

The upper part is the orbital part, also called the upper lacrimal gland, which is larger, and the shape is very similar to an almond, about 12 20 mm, and the lower part is the eyelid, also called the inferior lacrimal gland, which is smaller. The lacrimal gland has 10 12 excretory ducts, and the tear is excreted from these excretory ducts after it is produced. Tears are a weakly alkaline transparent liquid, in which water is the rest, and the rest are small amounts of inorganic salts and proteosomes, as well as other substances such as lysozyme, immunoglobulin A, complement system, etc.

After tears are produced, they are excreted through the tear ducts. The lacrimal duct consists of puncta, lacrimal tubules, lacrimal sacs, and nasolacrimal ducts. Tears enter the lacrimal tubule like a sewer and enter the lacrimal sac through a lacrimal tubule about 10mm long, which is specially used to collect and store tears and prevent tears from flowing out.

The size of the lacrimal sac is about 12 6 mm, and there is a tube 12 24 mm long and 3 6 mm in diameter under the lacrimal sac that leads directly to the nasal cavity, which is the nasolacrimal duct, and the tears in the lacrimal sac enter the nasal cavity through the nasolacrimal duct. Therefore, when we put eye drops, we should press down the lacrimal sac with our fingers, just to prevent the eye drops from flowing into the nasal cavity through the nasolacrimal duct People will shed tears when they are sad, sad, and sad; People shed tears when they are happy. Tears seem to be a symbol of emotional change, but in fact, tears do not exactly indicate a change in mood.

When a foreign object such as dust falls into our eyes, a large number of tears are generated and the foreign body is washed out. In addition to a large amount of water, there are lysozyme, immunoglobulins, complement system, lactoferrin, -lysin, etc., which have the effect of inhibiting the growth of bacteria. Therefore, tears have another very important function - defense.

In general, the conjunctival sac is not an ideal place for bacteria to survive, because the most suitable growth temperature for bacteria is 35 38, because when the eyes are opened, the tears evaporate, and the temperature of the corneal surface can be as low as 30, so it is not suitable for the growth of bacteria, but the temperature of the conjunctival sac will rise when the eyes are closed or bandaged for a long time, which is conducive to the reproduction of bacteria. The defensive effect of the conjunctival sac comes from the bacteriostatic substances in the tears. The main function of lysozyme in tears is to achieve the purpose of sterilization by decomposing polysaccharides present in the bacterial cell wall.

A total of five kinds of immunoglobulins have been found in tears, the most of which is immunoglobulin A, which can inhibit the attachment of germs on the surface of the mucous membrane, and dissolve bacteria with the participation of lysozyme, so as to achieve the purpose of sterilization. Lactoferrin inhibits the metabolism of bacteria by preventing the utilization of iron ions by bacteria, so as to achieve the purpose of sterilization. -Lysin is a non-lysozyme antibacterial substance, which mainly fights staphylococcus, lyses the cytoplasmic membrane of bacteria, and assists lysozyme.

In addition, tears can also moisten the surface of the eyeball, moisten the conjunctival sac, and change the optical properties of the cornea. You see, tears also have such an important role, so it's not just about a change in mood.

The lacrimal gland is where tears are produced, and if the lacrimal gland is removed, there will be no more hope of tear secretion.

It's easy to be lyrical, so crying isn't a bad thing.

I was crying two or three times almost every day ==

My classmates gave me the impression that they were crying.

But now I can't cry anymore.

Personally, I feel very wronged, so I will naturally cry.

You practice your eloquence, they say, you have a reason to reply to other people, and you won't let yourself cry if you are wronged.

It's easy to be emotional, and it's not a bad thing to be able to cry.

I used to cry two or three times a day.

Back = = The impression that my classmates gave me was that they loved to cry.

But now that I'm older, I can't cry if I want to.

If you feel wronged, you will naturally cry.

You practice your eloquence more What do they say, if you have a reason to reply to others, you won't let yourself be wronged, so you won't cry.

Summary. Caused by the obstruction or stenosis of the tear duct, the tear duct is located in the inner corner of the eye, connecting the conjunctival sac and the nasal cavity, and its main function is to discharge the tears secreted by the eye into the nasal cavity and be absorbed by the nasal mucosa. The diagnosis can be confirmed by tearal irrigation, if the ,.. is caused by a blocked or narrowed tear duct

Due to the formation of trichiasis or entropion, entropion and trichiasis can cause the eyelashes to prick into the cornea, thereby damaging the cornea and causing reflex lacrimation, which requires extraction, electrolytic trichiasis, or surgical correction of entropion**.

Why can't the tears end.

Caused by the obstruction or stenosis of the tear duct, the tear duct is located in the inner corner of the eye, connecting the conjunctival sac and the nasal cavity, and its main function is to discharge the tears secreted by the eye into the nasal cavity and be absorbed by the nasal mucosa. The diagnosis can be confirmed by tearal irrigation, if the ,.. is caused by a blocked or narrowed tear ductDue to the formation of trichiasis or entropion, entropion and trichiasis can cause the eyelashes to prick into the cornea, thereby damaging the cornea and causing reflex lacrimation, which requires extraction, electrolytic trichiasis, or surgical correction of entropion**.

Oh my God, you've said a great job! Can you elaborate on that?

Caused by the obstruction or stenosis of the tear duct, the tear duct is located in the inner corner of the eye, connecting the conjunctival sac and the nasal cavity, and its main function is to discharge the tears secreted by the eye into the nasal cavity and be absorbed by the nasal mucosa. The diagnosis can be confirmed by tearal irrigation, if the ,.. is caused by a blocked or narrowed tear ductDue to the formation of trichiasis or entropion, entropion and trichiasis can cause the eyelashes to prick into the cornea, thereby damaging the cornea and causing reflex lacrimation, which requires extraction, electrolytic trichiasis, or surgical correction of entropion**.

Summary. The reason why tears can't stop flowing Above the human eyeball, there is a place called the tear gland, which can constantly produce tears in addition to sleeping. But we don't feel tears, because usually these tears flow into the nasal cavity through the nasolacrimal ducts at the corners of the eyes.

Why can't the tears end.

The reason why tears can't stop flowing Above the human eyeball, there is a place called the tear gland, which can constantly produce tears in addition to sleeping. But we don't feel tears, because usually these tears flow into the nasal cavity through the nasolacrimal ducts at the corners of the eyes.

I'm still a little confused, can you be more detailed?

The reason why tears can't stop flowing Above the human eyeball, there is a place called the tear gland, which can constantly produce tears in addition to sleeping. But we don't feel tears, because usually these tears flow into the nasal cavity through the nasolacrimal ducts at the corners of the eyes.