1, the change of puberty genitalia
Adolescence is the age of growth and development, and it is also the period when various reproductive organs change. Generally, after puberty, under the action of follicle stimulating hormone, luteinizing hormone and androgen, it begins to develop rapidly, which is much faster than other systems.
The scrotum is like a wrinkled pocket, formed by the skin of the abdominal wall, and its color is darker than the surrounding skin. The scrotum is divided into left and right halves, which are connected in the middle. There is a testis and an epididymis in the left and right capsules. Scrotal skin is elastic, there are a lot of wrinkles on the surface, it relaxes when the temperature is high, and sebaceous glands and sweat glands secrete vigorously, which accelerates heat dissipation; When the temperature is low, it contracts, reducing heat dissipation and moving closer to the body. This automatic adjustment function of scrotum is mainly to protect the spermatogenic function of testis. Tintin is a male sex organ, with glans at the front and rich nerve fibers, which is the most sensitive part. After 1 year testicular development, Tintin began to grow and thicken, and developed into an adult at the age of 17 ~ 18. A thin layer of skin around the glans penis is called foreskin.
At the beginning of adolescence, due to the rapid increase and thickening of Tintin, the foreskin gradually retreated to expose the glans penis. If the foreskin is still wrapped around the glans after puberty and needs to be turned over to be exposed, it is said that the foreskin is too long; If it can't be turned out, it's called phimosis and needs surgery. There are often scales in the foreskin, and there are many scales during the development of youth. Always wash the foreskin upside down to avoid inflammation of the glans and foreskin. Testis is the most important part of male genitalia, and it is a pair of oval glands. Testicular volume is only larger than that of pre-adolescent infancy, less than 3 ml. After entering adolescence, the testis develops rapidly, and its volume can reach more than 12 ml. The length and tortuosity of the convoluted tubule increased, the lumen became thicker, spermatogonia on the basement membrane of the tubule wall continued to divide and reproduce, spermatogenic cells appeared in each stage, and finally developed into sperm. Testicles also secrete male hormones, so testicles are both reproductive organs and endocrine organs.
During the fetal period, the testis is in the abdominal cavity and descends into the scrotum after birth. Some boys have no testicles or only one side in the scrotum. This is because the testicles are still in the abdominal cavity and have not come down. Medically called "cryptorchidism", we should go to the hospital for examination and treatment as soon as possible. The accessory glands of male reproductive organs include seminal vesicle, prostate and urethral glands. After puberty, all the above glands develop rapidly and secrete liquid, which is mixed with sperm to form viscous milky semen. Nocturnal emission is a unique physiological phenomenon of men and an important symbol of adolescent development. After puberty, it will happen to healthy men.
The average age of first nocturnal emission is 14 ~ 16, which is about 2 years later than the average age of menarche in girls. The first nocturnal emission mostly occurs in summer. There may be no mature sperm in the initial semen. After the first nocturnal emission, the body development gradually slowed down, while the testis, epididymis and Tintin developed rapidly, approaching the adult level. Adolescent men, with the development of reproductive organs, appear hair (pubic hair, axillary hair, beard) growth, voice change, Adam's apple and other secondary sexual characteristics. Pubic hair appeared first, followed by armpit hair. After 1 year of armpit hair, a beard grew. Protrusion of Adam's apple is a unique secondary sexual characteristic of men.
2, male private parts care
1. You need a deep sleep after orgasm. After sharing a room, Tintin needs enough sleep. At night, when a man falls asleep, Tintin will have an erection for 3-5 hours. Erection at night is not for sharing a room, but for "charging" Tintin, increasing blood oxygen and ensuring Tintin's health. Dr. Goldstein said that the more erections there are during night sleep, the more elastic Tintin's erectile tissue will be.
2. Don't face hard objects. Violent impact with hard objects may lead to closed tearing of Tintin (commonly known as "Tintin Fracture"). If Tintin's cavernous body is completely torn, internal hemostasis and other surgical treatments must be carried out within 24 hours to reduce the permanent damage to Tintin. When the cavernous body is partially damaged, it will generally heal itself, but it may also bring some sequelae, such as abnormal bending, pain and impotence of Tintin. Statistics show that as many as13 men with impotence have a history of "Tintin trauma". Experts remind that when women are in the upper position, it is most likely to lead to male Tintin fracture.
Stay away from cigarettes. Smoking (including secondhand smoke) will affect Tintin's erectile hardness. A new study found that the Tintin erection of smokers is significantly smaller than that of non-smokers. Dr. Goldstein said that smoking not only damages blood vessels, but also damages Tintin tissue, which in turn leads to the decrease of Tintin elasticity and limited erectile function.
4. Take frequent walks. Dr. Goldstein said that a study involving 3 1000 people found that men who walked 2 miles a day were half as likely to have erectile problems as men who had been sedentary for a long time. Jogging for 20 minutes or lifting weights for 30 minutes every day has the same effect.
5. prevent derailment. Studies have found that men who cheat are more prone to impotence. One of the main reasons is that the guilt caused by cheating has turned into anxiety, which interferes with the brain nerves for a long time and leads to mental impotence. Another big reason is STD panic. After cheating, some men will suspect that they will be infected with sexually transmitted diseases, and this fear will gradually become a fear. In severe cases, it will lead to rejection of sexual life and impotence.
6. yawn often. Yawning and Tintin's erection are controlled by the chemical nitric oxide. After the substance diffuses in the male brain, it can not only reach the neurons that control breathing, but also descend along the spinal cord to the blood vessels that supply Tintin. If the two functions occur at the same time, when a man yawns, his tintin will also vibrate. Men yawn more consciously, which helps to improve Tintin's erectile function.
7. control blood sugar. More than 50% of male diabetic patients have erectile dysfunction. Diabetes will bring a double blow to Tintin. On the one hand, diabetes accelerates arterial disease, damages Tintin blood vessels and increases the risk of impotence. On the other hand, diabetes will damage the nerves, leading to a decrease in the transmission rate of estrogen throughout the body. Over time, Tintin will also be numb.