NationMaster - Encyclopedia: Vas deferens

The vas deferens (plural: vasa deferentia), also called ductus deferens, (Latin: "carrying-away vessel") is part of the male anatomy of some species, including humans. Image File history File links Drawing of the Male Internal Sexual Anatomy From alt. ... Image File history File links Gray1149. ... Human male anatomy The testicles, known medically as testes (singular testis), are the male generative glands in animals. ... Section of an artery For other uses, see Artery (disambiguation). ... The inferior vesical artery frequently arises in common with the middle hemorrhoidal, and is distributed to the fundus of the bladder, the prostate, and the vesiculÃ¦ seminales. ... The artery to the ductus deferens, as its name suggests, is an artery in males that provides blood to the ductus deferens. ... In mammals including humans, the lymphatic vessels (or lymphatics) are a network of thin tubes that branch, like blood vessels, into tissues throughout the body. ... The external iliac lymph nodes, from eight to ten in number, lie along the external iliac vessels. ... The internal iliac lymph nodes (or hypogastric) surround the hypogastric vessels, and receive the lymphatics corresponding to the distribution of the branches of the hypogastric artery, i. ... This article or section is in need of attention from an expert on the subject. ... The Wolffian duct (also known as archinephric duct, Leydigs duct, mesonephric duct, or nephric duct) is a paired organ found in mammals including humans during embryogenesis. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... For other uses, see Latin (disambiguation). ... The shield and spear of the Roman god Mars, which is also the alchemical symbol for iron, represents the male sex. ... Human heart and lungs, from an older edition of Grays Anatomy. ...

Structure

There are two such ducts; they are muscular tubes (surrounded by smooth muscle) connecting the left and right epididymis to the ejaculatory ducts in order to move sperm. Each tube is about 30 centimeters long (in humans). Cultured Smooth muscle of the aorta. ... Male Anatomy The epididymis is part of the human male reproductive system and is present in all male mammals. ... The Ejaculatory ducts are part of the human male anatomy, which cause the reflex action of ejaculation. ... A spermatozoon or spermatozoan ( spermatozoa), from the ancient Greek ÏƒÏ€ÎÏÎ¼Î± (seed) and (living being) and more commonly known as a sperm cell, is the haploid cell that is the male gamete. ...

They are part of the spermatic cords. Male Anatomy The spermatic cord is the name given to the cord-like structure formed by the vas deferens and surrounding tissue (veins, arteries, nerves, and lymphatic vessels) that run from the abdomen down to each testicle. ...

Function in ejaculation

During ejaculation the smooth muscle in the walls of the ductus deferens or vas deferens contracts reflexively, thus propelling the sperm forward. This is also known as peristalsis. The sperm is transferred from the vas deferens into the urethra, collecting secretions from the male accessory sex glands such as the seminal vesicles, prostate gland and the bulbourethral glands, which form the bulk of semen. Ejaculation is the ejecting of semen from the penis, and is usually accompanied by orgasm. ...

Significance in contraception

The procedure of deferentectomy, popularly known as a vasectomy, is a method of contraception in which the vasa deferentia (Latin plural) are permanently cut, though in some cases it can be reversed. A modern variation, which is also popularly known as a vasectomy even though it does not include cutting the vas, involves injecting an obstructive material into the ductus to block the flow of sperm. Vasectomy is a permanent birth control method for men. ...

Investigational attempts for male contraception have focused on the vas with the use of the intra vas device and reversible inhibition of sperm under guidance (RISUG). The intra vas device is a proposed contraceptive device for men, analogous to the IUD for women. ... RISUG (Reversible Inhibition of Sperm Under Guidance, formerly referred to as SMA) is the development name of a male contraceptive developed at IIT (Delhi) in India by Dr. Sujoy K Guha. ...

Blood supply

The Vas deferens is mainly supplied by an artery accompanying it (artery of vas deferens). This artery normally arise from either the superior vesical artery or the inferior vesical artery. Both these arteries arose from the internal iliac artery.

Additional images

See also

The intra vas device is a proposed contraceptive device for men, analogous to the IUD for women. ... Each seminal vesicle consists of a single tube, coiled upon itself, and giving off several irregular cecal diverticula; the separate coils, as well as the diverticula, are connected together by fibrous tissue. ...

External links

Categories: Male reproductive system | Anatomy stubs The State University of New York Health Science Center at Brooklyn, better known as SUNY Downstate Medical Center, is an academic medical center and is the only one of its kind in the Borough of Brooklyn in New York City. ... The State University of New York Health Science Center at Brooklyn, better known as SUNY Downstate Medical Center, is an academic medical center and is the only one of its kind in the Borough of Brooklyn in New York City. ... Not to be confused with pneumonic. ... The Medical University of Vienna , formerly the faculty of medicine of the University of Vienna, became an independent university on January 1, 2004. ... The human male reproductive system is a series of organs located outside of the body and around the pelvic region of a male. ... The reproductive system is the ensembles and interactions of organs and/or substances within an organism that strictly pertain to reproduction. ... In some male mammals, the scrotum is a protuberance of skin and muscle containing the testicles. ... The dartos is a layer of smooth muscular fiber. ... The external spermatic fascia (intercrural or intercolumnar fascia) is a thin membrane, prolonged downward around the surface of the cord and testis. ... The cremaster muscle is a muscle that covers the testis. ... The internal spermatic fascia (infundibuliform fascia) is a thin layer, which loosely invests the cord; it is a continuation downward of the transversalis fascia. ... The perineal raphe extends from the anus, through the mid-line of the scrotum (scrotal raphe) and upwards through the posterior mid-line aspect of the penis (penile raphe). ... Male Anatomy The spermatic cord is the name given to the cord-like structure formed by the vas deferens and surrounding tissue (veins, arteries, nerves, and lymphatic vessels) that run from the abdomen down to each testicle. ... The testicle (from Latin testis, meaning witness [1], plural testes) or ballock is the male generative gland in animals. ... This page meets Wikipedias criteria for speedy deletion. ... For other structures with the same name, see Tunica albuginea. ... The Appendix testis is a vestigial remnant of the MÃ¼llerian duct present on on the upper testis attached to the tunica vaginalis about 90% of the time. ... The mediastinum testis extends from the upper to near the lower extremity of the gland, and is wider above than below. ... The glandular structure of the testis consists of numerous lobules. ... Each lobule of the testis is contained in one of the intervals between the fibrous septa which extend between the mediastinum testis and the tunica albuginea, and consists of from one to three, or more, minute convoluted tubes, the tubuli seminiferi. ... Leydig cells, also known as interstitial cells of Leydig, are found adjacent to the seminiferous tubules in the testes. ... A Sertoli cell (a kind of sustentacular cell) is a nurse cell of the testes which is part of a seminiferous tubule. ... The blood-testis barrier (abbreviated as BTB) is a barrier between the blood vessels and the seminiferous tubules of the animal testes. ... Cross section of the epithelium of a seminiferous tubule showing various stages of spermatocyte development Spermatogenesis is the process by which male spermatogonia develop into mature spermatozoa. ... A Spermatogonium (plural: spermatogonia) is an intermediary male gametogonium (a kind of germ cell) in the production of spermatozoa. ... Spermatocytogenesis is the male form of gametocytogenesis. ... Spermatogenesis refers to the creation, or genesis, of sperm cells, which occurs in the male gonads or testes. ... it is the creation of spermatids from secondary spermatocytes through mitosis ... The term spermatid refers to the haploid male germ cell that results from secondary spermatocyte division. ... Spermiogenesis is the creation of a spermatozoon from a spermatid. ... A spermatozoon or spermatozoan ( spermatozoa), from the ancient Greek ÏƒÏ€ÎÏÎ¼Î± (seed) and (living being) and more commonly known as a sperm cell, is the haploid cell that is the male gamete. ... Human male anatomy The testicles, known medically as testes (singular testis), are the male generative glands in animals. ... The tubuli seminiferi recti (or tubuli recti, or straight seminiferous tubules) enter the fibrous tissue of the mediastinum, and pass upward and backward, forming, in their ascent, a close net-work of anastomosing tubes which are merely channels in the fibrous stroma, lined by flattened epithelium, and having no proper... Rete testis is an anastomosing network of delicate tubules located in the hilum of the testicle (mediastinum testis) that carries sperm from the seminiferous tubules to the vasa efferentia. ... The efferent ducts are part of the testes and connect the rete testis with the epididymis. ... Male Anatomy The epididymis is part of the human male reproductive system and is present in all male mammals. ... On the head of the epididymis is a second small stalked appendage (sometimes duplicated); it is named the appendix of the epididymis (pedunculated hydatid), and is usually regarded as a detached efferent duct. ... The Ejaculatory ducts are part of the human male anatomy, which cause the reflex action of ejaculation. ... At the forepart of the urethral crest, below its summit, is a median elevation, the seminal colliculus, upon or within the margins of which are the following: the orifices of the prostatic utricle the slit-like openings of the ejaculatory ducts. ... The internal urethral orifice is placed at the apex of the trigonum vesicae, in the most dependent part of the bladder, and is usually somewhat crescentic in form; the mucous membrane immediately behind it presents a slight elevation, the uvula vesicae, caused by the middle lobe of the prostate. ... In anatomy, the urethra is a tube which connects the urinary bladder to the outside of the body. ... The prostatic urethra, the widest and most dilatable part of the canal, is about 3 cm. ... The intermediate part of male urethra (membranous portion) is the shortest, least dilatable, and, with the exception of the external orifice, the narrowest part of the canal. ... The spongy urethra (cavernous portion of urethra, penile urethra) is the longest part of the urethra, and is contained in the corpus cavernosum urethraeÃ¦. It is about 15 cm. ... Upon the posterior wall of the prostatic urethra is a narrow longitudinal ridge, the urethral crest, formed by an elevation of the mucous membrane and its subjacent tissue. ... The term urethral gland (or Littre gland) is used to refer to any of the many glands that branch off of the wall of the urethra of male mammals. ... Nathan J. Youngers favorite peice of candy to suck on. ... The penis (plural penises, penes) is an external male sexual organ. ... A corpus cavernosum is one of a pair of a sponge-like regions of erectile tissue which contain most of the blood in the male penis during erection. ... Corpus spongiosum (Plural: Corpora Spongiosa) (also known as corpus cavernosum urethrae in older texts) is the mass of spongy tissue surrounding the male urethra within the penis. ... The cavernous portion of the urethra is narrow, and of uniform size in the body of the penis, measuring about 6 mm. ... The glans penis (or simply glans) is the pressure sensitive tip of the penis. ... The fundiform ligament is a specialization of the superficial (Scarpas) fascia of the abdomen. ... In males, the suspensory ligament of the penis is attached to the pubic symphysis, which holds the penis close to the pubic bone and supports it when erect. ... The foreskin or prepuce (a technically broader term that also includes the clitoral hood, the homologous structure in women) is a retractable double-layered fold of skin and mucous membrane that covers the glans penis and protects the urinary meatus when the penis is not erect. ... The word frenulum on its own is often used for the frenulum of prepuce of penis, which is an elastic band of tissue under the glans penis that connects to the prepuce, or foreskin to the vernal mucosa, and helps contract the prepuce over the glans. ... The seminal vesicles are a pair of simple tubular glands posterinferior to the urinary bladder of males. ... Each seminal vesicle consists of a single tube, coiled upon itself, and giving off several irregular cecal diverticula; the separate coils, as well as the diverticula, are connected together by fibrous tissue. ... The prostate is a compound tubuloalveolar exocrine gland of the male mammalian reproductive system. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ... On either side of the urethral crest is a slightly depressed fossa, the prostatic sinus, the floor of which is perforated by numerous apertures, the orifices of the prostatic ducts from the lateral lobes of the prostate. ... A bulbourethral gland (or Cowpers gland) is one of two small exocrine glands present in the reproductive system of human males. ...

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