Development characteristic of the boy organ

Development characteristic of the boy organ
The reproductive system is that the human body produced reproduction cells, bred the important part of the offspring, its men and women of institutional framework are different. Two parts outside of one's job of the boy's genitals, inner genitals are testis, spermatic duct and subsidiary gland; Other genitals are scrotums and penises. The above is referred to as sexual organ, introduce boy's development characteristic of the sexual organ before adolescence respectively as follows.Unless produce by sperm in the future testis, so it is for genitals of boy,at testis in song tubes precises thin among last a large amount of androgen and a small amount of estrogen quality cell, so is boy's important endocrine organ. Before adolescence, the testis is in inmature state, the volume is fewer than 3 ml, thin precise tube of song producing the sperm in the testis is narrow and detailed, can't see that is in charge of. About 10 years old, the thin precise tube of song begins development, the tube wall presents the precise original cells of small quantity, about 12 years old, the testis develops rapidly, the volume is increased to more than 12 ml, length and twists degree of the thin precise tube of song increase, the precise original cells of the tube wall are being split and bred constantly, develop into every one and grow meticulous afterbirth progressively, produce sperms finally, quality with time cells secrete androgen,etc..The sperm that produces in the testis has not been totally ripe yet, it continues drawing nutrition and combining development behind entering the epididymis. The spermatic duct connects the epididymis tail closely, formate the ejaculatory duct with the excretory duct of the seminal vesicle gland, open in the urethra through the prostate. Testis rarr; Epididymis rarr; rarr of spermatic duct; rarr of ejaculatory duct; The road junction of the urine, it is the only way arranged outside a sperm.While testis,etc. develops, body of subsidiary gland such as seminal vesicle gland, prostate and bulbourethral gland are accelerated ripely, secrete the milky white viscous liquid with special pungent smell respectively, converge with the sperm into seminal fluid, existence and activity of the sperm are extremely important.The boy's external genitalia is scrotums and penises. The scrotum is a thin wall bag bag, install testis and epididymis inside, both sides are one respectively. Childhood scrotum skin tender, volume little, increase progressively with development of the testis begin, adolescence, pigmentation appears. The cover of the scrotum has good elasticities to make the elasticity fiber, contract after cooling and wrinkle and roll over in order to keep warm, launch in order to help to dispel the heat when it is hot, thus guarantee the development at the normal temperature of testis and give play to the function. Unless form by body of three pieces of sponge penis, expand front to glans penis,at is there urethra it open one's mouth. Penis begin development during 11-14 years old, increase about late 1-2 year than testis, 15-16 year old development such as adult, have, erect function, first spermatorrhea appears.

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