The structure of the male reproductive system

The structure of the male reproductive system.  Drawing from the site www.sciencephoto.com

Male: anatomically divided into the exterior — the penis and scrotum and inner — testes, epididymis, vas deferens way, prostate, seminal vesicles. Functionally, the male sex organs are the organs of copulation and the reproductive system. In the vulva focused receptors that perceive erogenous stimulation (erogenous zones).

Vulva

Penis(Penis, phallus) — an external male sexual organ, an employee for sexual intercourse, delivery of sperm (sperm) into the female's vagina, and excretion of urine from the bladder.

Distinguish the root (base), the body (trunk) and head of the penis. The trunk is formed by the two cavernous and spongy bodies that contain a large number of pits (lacunae) that are easy to fill with blood. Spongy body of the penis at the end of the tapered ends thickening — the head of the penis. Edge of the head, covering the ends of the corpora cavernosa, merges with them to form a thickening (halo) around the circumference, which is located behind coronal sulcus. The head is covered with a thin tender skin (foreskin) with lots of glands that produce smegma.

At the head of the penis has a large number of nerve endings, which makes it the most sensitive to the touch. High sensitivity is also shaft of the penis, especially the lower zone in the area of 2-3 cm from the head. Stimulation of the penis leading to erection increased. The upper portion of the head has a hole — is output urethra through which a urination and release sperm.

The appearance of the penis, as well as other parts of the human body is very individual. Direct penis is rare, often the penis at rest seems right, but the erection is curved.

Penis size Adult males average in the rest of 5-10 cm in erection — 14-16 cm, that is about the size of a woman's vagina. Often, short erection penis increases proportionately more than the long. Shape of the penis during erection and angle of individual. Erect penis length of 16-18 cm is considered to be a major, and 18-20 cm or more — a giant. The diameter of the penis, usually not more than 3-4 cm

The average length of the penis at birth ranges from 2.4 to 5.5 cm at the beginning of puberty — 6 cm, achieving adult size within the following years up to 17 years penis grows vigorously to 25 years old — slightly.

When sexually aroused penis expands to 2-8 times, becoming a fairly dense. Maintaining an erection is provided by decreasing venous return, which contribute to the reduction of specific muscles that lie at the root of the penis. At the end of the excitation muscles relax and blood fills the penis, easily flows off, after which it drops to normal and becomes soft. Head of the penis when erect is always less elastic and more resilient compared to its body, which prevents the trauma of female genital mutilation.

In the front section of the body of the penis skin forms a skin fold — the foreskin, which is fully or partially covers the head. The foreskin, if it completely covers the head, usually easily pushed back, exposing her. On the back surface of the foreskin of the penis head is connected to the longitudinal fold, called the bridle. Between the head of the penis and the foreskin is slit-like (preputial) cavity, finally emerging to the age of two the child. In the prepuce normally accumulates smegma.

With age, the skin of the penis become noticeable hair follicles, and in the future, and a small amount of hair. Sometimes the hair follicles with enlarged sebaceous glands are perceived by adolescents as "zits."

Smegma (Preputial lubricant) — The Secret glands of the foreskin that accumulates under its inner layer and in the coronal sulcus of the penis. Main components — fats, and mycobacteria. Fresh selection are white and uniformly distributed on the surface of the head, after a while they become yellowish or greenish hue. Smegma serves as a coating on the head and reducing friction on her foreskin. Smegmoobrazovanie increases in the period of greatest sexual activity (18 — 25 years) and is virtually absent in old age.

Long stagnation in smegma prepuce with phimosis, violations of the rules of personal hygiene contributes to the development of inflammatory and precancerous lesions of the penis. As a preventive measure to prevent stagnation of smegma, from early childhood, to comply with the rules of hygiene male genitalia. Smegma, as well as other substances serving grease should be removed daily. Daily thorough washing away — an absolute necessity. This rule also applies to men who have been circumcised — they smegma can build up in the folds of the bridle, if she survived, and coronal sulcus.

Usually the troubles caused by the accumulated smegma are teenagers, if they are contemptuous of the rules of hygiene. They called smegma "putty" and removed her hands dirty when it hardens. In his youth, it was poor hygiene is the most common cause of infectious diseases of the genital organs. With proper care smegma is not harmful to health.

Sperm (Semen, ejaculate) — a mixture of allocated during ejaculation secretions of male sex organs: the testes and their appendages, prostate, seminal vesicles, urethra. Semen is composed of two separate parts: the seminal plasma — mostly formed from the secretion of the prostate, testicular secretions, their appendages and seminal duct cancer, and of the blood cell (sperm or primordial germ cells of the testes).

  • The fluid from the seminal vesicles (65%)
  • Liquid from prostate (30%)
  • Sperm cells (5%).

Adult male sperm is a sticky, viscous mucoid and non-uniform opaque liquid with a characteristic odor. Taste semen as well as odor character determined power and usually slightly sweet and salty to sour or bitter flavor. With frequent semen ejaculation becomes less sweet and bitter taste is enhanced. Within 20-30 seconds semen is diluted, it becomes a homogeneous, viscous and has an opaque whitish-gray color. The number of its individual and can range from 1-2 to 10 ml or more. Sperm count can vary depending on age, health status, the amount of fluid on the frequency of ejaculation and so on. The more often committed sexual or masturbatory acts, the less the amount of each subsequent portion of the ejaculate. A large amount of semen does not mean its higher fertilizing capacity. The average volume of semen, provided that ejaculation occurs with 3 day intervals, ranging from 3 to 5 ml.

Fertilizing capacity of sperm indicates the amount of sperm in one ml of semen, which is normal is 60-120 million, with motile spermatozoa should be at least 70% of their total number, the lower limit of normal (according to WHO) considered to be at least 20 million spermatozoa in 1 ml (semen).

Scrotum — skin-muscular organ located in the cavity of which the testes, epididymis and the initial division of the spermatic cord, separated by a partition, which corresponds to the outside of the embryonic seam. The seam can be well seen, or vice versa, almost invisible. On health is not affected.

Pigmented skin of the scrotum is covered with sparse hair, contains a large number of sweat and sebaceous glands, the secret of which has a specific smell. Placing testes in the scrotum can create them for temperature lower than inside the body. The optimum temperature is 34 — 34,5 ° C. The temperature is kept nearly constant due to the fact that the scrotum is below in warm conditions and tightened to the body in cold conditions. The scrotum is also an organ of sexual feelings of a man (an erogenous zone.)

The structure of the male reproductive system

The internal reproductive organs

Testicles (Testes, testicles) — paired male sex gland
, the main function of which is the formation and release of sperm into the bloodstream of male sex hormones (testosterone). Are located inside the scrotum and testes are usually located at different levels (usually the left below right) may also vary in size. The size of each testicle in length — 6.4 cm in width — 2.5-3.5 cm

Testicles need special attention to comply with the rules of hygiene male genitalia. Low eggs must be 4 degrees below body temperature, since too high temperatures gives the formation of spermatozoa. Even a one-time immersion of eggs in the hot water can impair the ability to fertilize the next six months. Men, leading a sedentary lifestyle, have from time to time to get up and walk to the testicles were pushed from a hot body.

Ejaculatory way (Vas) — ducts through which sperm is derived from the testicles. They are an extension of the channel of the epididymis, pass through the inguinal canal, then connected together to form a single ejaculatory duct. which passes through the prostate gland and opens the hole in the rear part of the urethra. Promotion of sperm ejaculatory ways is their wavelike contractions during orgasm sperm through a common ejaculatory duct enters the urethra and out of it outside or inside the vagina.

Spermatic cord — Doubles anatomical organ coming from the epididymis to the confluence with the flow of the seminal vesicle. Its main function testicular blood supply and removing the seed from the epididymis to the vas deferens.

Prostate (Prostate) — unpaired body of the male reproductive system that produces a secret part of the semen, which is located between the bladder and the rectum. Passes through the prostate urethra.

The value of the prostate depends on the age, full of iron up to 17 years. Outside prostate coated capsule of dense connective tissue. Glandular tissue is composed of glands that open into the prostate part of the urethra ducts. The removal of secretions from the prostate glands contributes to the contraction of smooth muscle cancer. Massive secretions occurs during ejaculation.

The secret of the prostate (prostatic juice) is a cloudy white liquid, which is involved in the liquefaction of semen, stimulates the movement of sperm. Prostate and moves the vas deferens sperm and ejaculation, is involved in the formation of libido and orgasm.

Seminal vesicles — paired glandular formation, producing a secret, which is part of semen. Its content consists of a viscous liquid protein with a high content of fructose, which is the source of energy for sperm cells and makes them more resistant.

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