Adolescent men must pay attention to the changes in this thing

The male reproductive organs are divided into two parts: internal and external. The internal reproductive organs include the testicles, vas deferens and accessory glands; the external reproductive organs include the scrotum and penis. These organs develop very slowly before puberty, but after entering puberty, they begin to develop rapidly under the action of follicle-stimulating hormone, luteinizing hormone and androgen, and their speed far exceeds that of other systems.

The scrotum is a wrinkled small pocket formed by the skin of the abdominal wall. It is darker in color than the surrounding skin. The scrotum is divided into two halves, connected in the middle. Each half contains a testicle and an epididymis. The skin of the scrotum is elastic and has many wrinkles on the surface. It relaxes when the temperature is high, and the sebaceous glands and sweat glands secrete vigorously, accelerating heat dissipation. When the temperature is low, it contracts, reduces heat dissipation, and leans against the body. This automatic regulation function of the scrotum is mainly to protect the spermatogenic function of the testicles.

The penis is the male sexual organ, with the glans at the front end, which is rich in nerve fibers and the most sensitive part. One year after the testicles develop, the penis begins to grow larger and thicker, and develops to the level of an adult at the age of 17 to 18. The thin layer of skin covering the glans is called the foreskin.

At the beginning of puberty, the penis rapidly grows and thickens, and the foreskin gradually moves back to expose the glans. If the foreskin still covers the glans after puberty and needs to be turned over to be exposed, it is called prepuce. If it cannot be turned out, it is called phimosis, which requires surgical treatment. Smegma is often accumulated in the foreskin. During puberty, more smegma is produced. The foreskin should be turned over and washed frequently to avoid inflammation of the glans and foreskin.

The testicles are the most important part of the male reproductive organs. They are a pair of oval glands. Before puberty, the volume of the testicles is only slightly larger than that of infants, less than 3 ml. After entering puberty, the testicles develop rapidly, and the volume can reach more than 12 ml. The length and tortuosity of the seminiferous tubules inside increase, the lumen thickens, and the spermatogonia on the basement membrane of the tubule wall continue to divide and multiply, and spermatogenic cells of various stages appear, and finally develop into sperm. The testicles also secrete male hormones, so the testicles are both reproductive organs and endocrine organs.

During the fetal period, the testicles are in the abdominal cavity, and they descend into the scrotum after birth. Some boys have no testicles in the scrotum or only one side of the scrotum. This is because the testicles remain in the abdominal cavity and have not descended. This is medically called "cryptorchia" and should be checked and treated in the hospital as soon as possible.

The accessory glands of male reproductive organs include the seminal vesicles, prostate glands, and bulbourethral glands. After puberty begins, the above glands develop rapidly and secrete fluid, which mixes with sperm to form viscous milky white semen. Sperm emission is a physiological phenomenon unique to men and an important sign of puberty. It can occur in healthy men after puberty.

The average age of first spermatorrhea is 14 to 16 years old, which is about 2 years later than the average age of menarche for girls. The first spermatorrhea usually occurs in summer. There may be no mature sperm in the early semen. After the first spermatorrhea, physical development gradually slows down, while the testicles, epididymis and penis develop rapidly, approaching the adult level.

During adolescence, males develop secondary sexual characteristics such as hair growth, voice change, and the appearance of Adam's apple as their reproductive organs develop. Pubic hair appears first, followed by armpit hair. A beard grows one year after the appearance of armpit hair. The protrusion of Adam's apple is a secondary sexual characteristic unique to males.