Male reproductive system

Male reproductive system
The reproductive system produces reproduction cells, breed the offspring, secrete the organ that sex hormone maintained a sex character. On the basis of the position where one stays, can be divided into inner genitals and part of external genitalia two. The genitals include testis, epididymis, spermatic duct, ejaculatory duct, prostate, seminal vesicle gland in men. (1) The testis testis is a male gonad, each one about, take the form of ovum garden, is suspended it in midair in the scrotum by the spermatic cord, it is about 4- 5cm long, it is about 3- 4cm thick, each value about 15gs. Produce grand sexual reproduction cells (namely the sperm) Organ,too it is which be produced sex hormone male for endocrine glandses main.The internal structure of testis: There is membrane of dense connective tissue one layer thick on the surface of testis, call white membrane. White film is a loose connective tissue inside, have abundant blood vessels inside, call the vascular film. The white membrane of the testis carries the side to increase in it thick, and fall into the testis, it is mediastinal to form the testis. It is stretched into the testis essence radially, divide the testis into several small leaves that mediastinal. It contains 1- 3 crooked songs to be detailed to in charge of while being precise in the each small leaf, it converge, become one direct detailed to in charge of while being precise a short frank one in little the intersection of leaf and top, enter mediastinal, small tube these each other identical to become network when being mediastinal, form the intersection of testis and network, send out 12- 13 light to in charge of by the intersection of testis and network, claim testis export in charge of, they wear appear pale membrane enter epididymis in the hair a crooked one. Song thin precise tube have rooms of the intersection of quality and cell can secrete male sex hormone, promote male genitals and the intersection of man and second development of sex character and keep. Leather cells have function of producing the sperm on the detailed precise tube of song, the song thin precise tube combines to manage each other detailedly and smartly directly, it is the pipeline system that the sperm transported, gathers, formates a tube and enters the epididymis head finally, discharge outside the body through the spermatic duct. (2) Epididymis
It was tortuous that the epididymis is an epididymis in charge of in the trailing edge of the testis, there are very thin fibrous tissue and honeycomb that were organized between the small tubes, , body, part of end three separately. The testis pretext exports the tube to form, the tube wall is replied the cover on one layer of columns to form false, contain two kinds of cells, one has covers on columns of cilium; Another kind is the low secreting cells in post form, cell height is arranged alternately, so in charge of a of abnormality and become the cockscomb structure. The body end of the epididymis is made up of epididymis tube, this tube is replied the cover on the cilium in post form of layer to form false, pay leather height to be unanimous, in charge of one of rules. Epididymis appearance slender and flat in shape, like semilune also, all one left and right sides, long 5cm nearly, attach to the back side of the testis. The epididymis stores and discharges sperms, impels sperms ripely and secretes the liquid and supply the sperm with trophic action. The above-mentioned physiological function is finished by absorption, secretion and concentrating the function of skin cells on the epididymis. (3) Spermatic cord, spermatic duct and ejaculatory duct spermatic cord: In charge of garden of belly between the ring ask for the form thing to groin from the intersection of testis and top. The spermatic cord starts from the ring in the groin, stop hanging the testis and the softness of the epididymis is taken in the testis trailing edge, all first left and right sides, total length about about 14cm. Include spermatic duct, artery, intravenous, nerve and honeycomb to organize in the spermatic cord. The artery is testicular arteries, spermatic duct arteried and carries the testis skin artery. The vein is a climing form clump. The spermatic cord is that testis, epididymis, spermatic duct blood, lymphocytic liquid circulate the thorough fare, also guarantee growing precise function and main route which the ripe sperm sends of the testis. The spermatic duct is one of the main structure in the spermatic cord, start from the epididymis tail, is in charge of the groin and enter the cavum pelvis. The conduct of travelling centre between ureter and bladder of spermatic duct, terminal it expands to expand and form the ampulla of ductus deferens, manage and converge with the seminal vesicle finally. Terminal it converges with the excretory duct of the seminal vesicle gland into an ejaculatory duct, crosses the prostate, open in the urethra. The tube wall is thick, total length about 40- 46cm, diameter about 2- 3mm. The spermatic duct is that the sperm is delivered from the epididymis to a urethral only thorough fare of prostate. The ejaculatory duct is the continuity after the ampulla of ductus deferens is in charge of converging with the seminal vesicle. The ejaculatory duct is very short, it is only about 2cm to be long, the tube wall is very thin. (4) Seminal vesicle gland, prostate and bulbourethral gland seminal vesicle gland are the body of gland of a pair of flat long bags, all one left and right sides, surface full of bumps and holes to take the form of tubercle, lie outside the terminal spermatic duct and below the back bladder, it is the excretory duct of the seminal vesicle gland that it is terminal tiny, converge with the end of the spermatic duct into an ejaculatory duct, in the urethra in the urethral prostate department opening. The seminal vesicle is about 4- 5cm long, about 2cm wide, volume about 4ml. The gland bag of the form in order to flex of seminal vesicle, it is mainly a precise slurry that it secretes liquid, accounts for about 70% of the seminal fluid, have an important effect on surviving of the sperm. The prostate is the body of gland of a chestnut, the sunken ditch while having, rise slightly on both sides, the bottom connects upwards with bladder, support the membrane of muscle on the urine reproduction diaphragm downwards sharp. It is about 18g in weight. The prostate can secrete the liquid of prostate, it is mainly a precise slurry, contain many kinds of microelements and many kinds of enzyme. On the near end of precise mound, the smooth muscle is strengthened, called the sphincter before the prostate, the function of ejaculating that prevent driving in the wrong direction.Bulbourethral gland: One respectively left and right sides, in the deep bag of perineum between the membrane of rib above and below urine reproduction diaphragm, open on the urethral near end of the ball. Can secrete a small amount of liquid, it is one of the compositions of the precise thick liquid. (5) The function that the male urethra of urethra urinates, also arrange precise functions. It is about 12- 20cm long. Among them there is bulbourethral gland, secrete the liquid, participate in the composition of the seminal fluid, the function of lubricating the glans penis when there is sexual intercourse. The seminal fluid is made up of liquid that the sperm, seminal vesicle gland, prostate secrete, milky white, ejaculate about 2- 3 ml once, includes 3- 5 hundred million sperms. The male external genitalia is penis and scrotum (1) Penis: The penis is wrapped up the membrane of muscle and skin to form outside the body by three pieces of sponge. Among them there are two corpora cavernosa penis, there is one body of urethral sponge. Assign to the root, body department and head. The root is affixed to the perineum department, the front of penis expands and forms the glans penis partly, head and the intersection of body portion and relatively detailed connection site, shank, one annular ditch, also call, preceded form ditch. There are urethras that are passed in the body of urethral sponge, open in the external urethral orifice. The penis takes the form of cylinder when not erecting, it is about 7- 9cm long. While erecting, the cylinder triangular in shape, the length doubles the above, main function is to finish sexual intercourse. The bread has skin outside the penis, wrap up and cover the glans penis, are called the prepuce of penis. Important institutional framework of the function of erecting that the special structure in the corpora cavernosa penis is the penis, and the penis erects to finish the precondition of sexual intercourse. (2) Scrotum: Scrotum one skin the intersection of bag and bag, below the back lie in penis. The skin of the scrotum is thin and soft, have a small amount of pubes, pigmentation is obvious. The scrotum wall is made up of skin and meat membrane. The membrane of meat contains the smooth muscle fibre. The smooth muscle presents the diastaltic one with the external temperature easily and contracts, in order to regulate the temperature in the scrotum, favorable to the development of the sperm. When being high such as the external temperature, smooth muscle relaxation; But shrink when the external temperature is low. Meat membrane line send out in the scrotum through divide Left deviation, two of Right deviation into the intersection of scrotum and to dark department in centre, hold testises and epididymises on both sides separately.News this amount to 2 page, at present in page 1 1 2


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