Boy's sign of development in adolescence

Boy's sign of development in adolescence
Pubes
While the second sex character of man appear, the change of the hair is the most outstanding. Among them it is pubes that appear first, at about 11-12 years old on average, first on both sides of the penis root, spread to perineum portion gradually later, color by shallow to darken, become thick and roll, about 18 years old later, the pubes takes the form of the triangle of pinnacle and is distributed, its peak usually reaches the small belly, similar to the typical adult man's pubes. These signs show, this boy has been already closing to mature period.
Men are in the adolescence development course, it should not be alarmed to meet the above-mentioned situations, without uncomfortable, can be thought development to be normal.
Penis
The penis is a male sexual behavior organ. Will seldom exceed 5 centimetres before adolescence, probably look very fast among 12- 13 years old, it is very long to about 12 centimetres at end to youth. Even the maturity men who has finished youthful development, the difference can be very big, just the same as people's stature wears high shortly, but will seldom influence its function. The front of the penis is the glans penis, because of covering with nerve fibres, so is the most sensitive position. Bread wear a layer of skin, call " foreskin " outside the glans penis of infant and pre-school children . After youthful development is accelerated, or when being close to maturational age, the foreskin will have shrunk back and the glans penis emerges backward gradually. Have many people reach the intersection of adult and the intersection of period and still longer foreskin, meet this kind of situation, so long as often pay attention to the hygiene, turn over the foreskin and get up and pay and wash, does not allow the dirt to pile up inside, will neither will influence the health influence, noring function.
Testis
The testis is man's most important inner genitals. Oval in shape, have one, exist in the Nan nature scrotum Yu. The main function of the testis has two respects: Produce sperms and secrete male sex hormone, the latter can influence male genitals development and appearance of second sex character directly. The testis generally about 12 years old begins to increase, already close to the volume of adult's testis at about 18 years old. Testis development, the volume increases, with the increase of the testis, its structure and function have changed correspondingly. The boy can produce adult's sperm of kind at about 18 years old. Liquid that the mucus that sperm and prostate, seminal vesicle, bulbourethral gland secrete mix and become, called the seminal fluid. After the seminal fluid is stored for regular hour and quantity in the body, if has not been absorbed in the body, will discharge outside the body, this course is named " passes out semen " . When appear for the first time to also let " Pass out semen for the first time " . According to the investigation, the mean age of passing out semen and taking place for the first time is about 16 years old, the earliest appearance is at 11-12 years old, but there might not be ripe sperm in the seminal fluid. Will pass out semen again in half a month every ten days after spermatorrhea for the first time, all these are normal physiological phenomenon.
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