Noun encyclopaedia of _ andrology of male penis

Noun encyclopaedia of _ andrology of male penis
Because the forming of the penis receives the stimulus of particular cortisol in embryo's body. Without this hormone, the genitals of the embryo will develop into women's vagina. From penis to below of the testis, the trace after can see and amalgamate. Because some embryos have not totally amalgamated, there are openings below the penis. Must want the operation to mend, otherwise the urine may be flowed out from penis lower side.
Penis (penis) Can be divided into the head, body and three parts of root. Back end the intersection of penis and root, hide on scrotum and the intersection of perineum portion and dark piece of skin, affix to pubic bone prop up and ischium prop up, in order to fix the department. The middle part is the body of penis, take the form of cylinder, has hung in pubic symphysis ago with the ligament, for the moving department. Penis front expand some as glans penis, peak of head have the intersection of arrow and narrow external urethral orifice (external orifice of urethra) . Thinner part is a penis neck behind the head.
The penis is mainly made up of two pieces of corpora cavernosa penis and body of a urethral sponge, the other bread is with the membrane of muscle and skin. Corpora cavernosa penis (cavernous body of penis) It is a round cylinder with detailed both ends, Left deviation, having one respectively, lie in the back side of the penis. Both combine closely in Left deviation, right, stretch forward, the peak attenuates, the ones that imbedded the glans penis behind are sunken inside. Back Left deviation, right of corpora cavernosa penis separate, call penis foot, attach to pubic bone of both sides prop up and ischium prop up respectively. Body of urethral sponge (cavernous body ofurethra) The side of belly located in corpora cavernosa penis, the urethra runs through its total length. Middle part take the form of cylinder, front expand for glans penis, expand to call the urethral ball (bulb of urethra) while being back ,Lie between two penis feet, secure beneath urine reproduction diaphragm. Fibrous membrane that it is dense one layer thick to be coated with outside body of each sponge, called white membrane and white membrane of body of urethral sponge of corpora cavernosa penis separately. The sponge is formed by a lot of sponge body Xiao Liang and one of cracks within the body, one of cracks is the sinus crack communicating with blood vessel. When one of cracks is congested, the penis is thickened and changed hard and erected promptly. Three pieces of sponge are coated with muscle membrane and skin of light, deep penis together outside the body.
The skin of the penis is thin and soft, rich in the spreading, the cover does not have adipose tissue to play. The skin sticks to the head, neck and deep layer closely, the other part is easy to dissociate to loosen, the skin of penis is free from the forward reflection of neck, form the double-deck annular skin pleat of the bag interconnected system glans penis, called the prepuce of penis (prepuce of penis) . The front of the foreskin is enclosed into a foreskin mouth, on the line in the belly side of glans penis, even the skin pleat during external urethral orifice underpart and foreskin, called the foreskin bringing (frenulum of prepuce) . While making foreskin ring to cut, should notice that does not hurt the foreskin to take, so as not to influence the normal erection of the penis.
Foreskin of infant relatively long, wrap up, write whole glans penis, foreskin mouth too little. With the growth of age, the foreskin shrinks back gradually, the foreskin mouth is expanded gradually too. If the foreskin covers the external urethral orifice, but can have while turning over and showing external urethral orifice and glans penis, it is too long that called the foreskin. When the foreskin mouth is too small, the complete bag of foreskin can't be opened to write the glans penis, are called the capistration. Under two situation these, easy to inflammation takes place because of stimulus of the filth in the foreskin, can also become a factor of bringing out penis cancer.
The penis is the man's excretion urine and sexual intercourse, the organ copulating. The body of penis is made up of corpora cavernosa penis and body of urethral silk floss, have abundant blood vessel, nerve, lymphatic vessel. It is the most abundant in place nerve supply that the penis precededs in the form ditch, sensitiveness is the highest.
The human penis lacks the vigorous cartilage that reinstated compared with other mammals, but use congestion to make it erect. The human penis can't shrink in the groin. That is a kind of characterized psychological problem, call and draw back the open disease.
Length and thickness
As tall and short as people, the size of the penis has nothing in common with each other too. Hearsay, the western white race's penis size will be greater than the Asian ethnic group. From 7.5 centimetre to 11 centimetre according to the American white man's penis length while relaxing of statistics, there can be 10 centimetre to 18 centimetre while erecting. 7 centimetre to 16 centimetre is all normal when the Asian ethnic group erects. The size of the penis, and male sex ability has nothing to do, it is not also the key element of influencing women's acquired character pleasant sensation. Think, the male penis length is greater than 5CM and can exercise the normal function on general medical science.
People's penis, stature height, fat and thin, size of facial features,etc. have numerous differences equally, different in size, thickness is not neat. Domestic Shi ChengLi has determined the length that penis size and 126 healthy and male penises of 1412 healthy male young men in China erect. The result shows, it is 19 to be the longest at the time of the normality. 5 centimetres, it is 3 centimetres shortest, average 8. 375 centimetres; The largest 14 centimetres in girth, minimum 2. 5 centimetres, average 7. 3 centimetres. It is 23 centimetres longest while erecting, it is 8 centimetres shortest, average 12 centimetres; Largest 14 centimetres of girth while erecting, minimum 8 centimetres are average 10. 75 centimetres. The penis length of 1000 normal adult men whom Liu GuoZhen,etc. investigated is: Length range is 4 normally. 9- 8. 6 centimetres, average 6. 55 centimetres, longest 11. 6 centimetres, shortest 3. 7 centimetres. Wu WeiCheng,etc. measures 2547 16- 25 years old men university student's penises, the average of its length is 7. 43 centimetres, cross-section diameter is 8 on average. 17 centimetres; The penis is led longly and averagely 13. 34 centimetres, with the erection length 13 that is calculated. 08 centimetre similar, consider, lead, can represent length erect, while being long. It is obvious different authors' measurement result has certain differences too, its result is still influenced by area, nationality,etc.. In addition, can all make the penis abbreviatory under normality when being not invariable, if tense, cold or tired.
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