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In anatomy, the urethra (from Greek ουρήθρα - ourethra) is a tube which connects the urinary bladder to the outside of the body. The urethra has an excretory function in both sexes to pass urine to the outside, and also a reproductive function in the male, as a passage for semen. Image File history File links No higher resolution available. ...
For other uses, see Latins and Latin (disambiguation). ...
This article or section is in need of attention from an expert on the subject. ...
The urogenital sinus (also known as the persistent cloaca) is a part of the human body while it is an embryo. ...
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. ...
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Human heart and lungs, from an older edition of Grays Anatomy. ...
This article is about the urinary bladder. ...
This article is about the urine of animals generally. ...
Horse semen being collected for breeding purposes. ...
The external urethral sphincter is a striated muscle that allows voluntary control over urination. In mammals the flow of urine from the urinary bladder is controlled by a group of muscles collectively called the urethral sphincter, named for their proximity to the urethra. ...
Manneken Pis of Brussels. ...
Anatomy
Female urethra In the human female, the urethra is about 1 1/2-2 inches (3-5 cm) long and opens in the vulva between the clitoris and the vaginal opening, extending from the internal to the external urethral orifice. It is placed behind the symphysis pubis, imbedded in the anterior wall of the vagina, and its direction is obliquely downward and forward; it is slightly curved with the concavity directed forward. Its lining is composed of stratified squamous epithelium, which becomes transitional near the bladder. The urethra consists of three coats: muscular, erectile, and mucous, the muscular layer being a continuation of that of the bladder. Between the superior and inferior fascia of the urogenital diaphragm, the female urethra is surrounded by the Sphincter urethae. Somatic innervation of the external urethral sphincter is supplied by the pudendal nerve. The uro-genital sinus may be divided into three component parts. The first of these is the cranial portion which is continuous with the allantois and forms the bladder proper. The pelvic part of the sinus forms the prostatic urethra and epithelium as well as the membranous urethra and bulbo urethral glands in the male and the membranous urethra and part of the vagina in females The external genital organs of the female are collectively known as the vulva (plural vulvae or vulvas)[1]. In common speech, the term vagina is often used improperly to refer to the vulva or female genitals generally, even though, strictly speaking, the vagina is a specific internal structure, whereas the...
The clitoris is a sexual organ that is present only in female mammals. ...
The vagina, (from Latin, literally sheath or scabbard ) is the tubular tract leading from the uterus to the exterior of the body in female placental mammals and marsupials, or to the cloaca in female birds, monotremes, and some reptiles. ...
Male urethra In the human male, the urethra is about 6 inches (15 cm) long and opens at the end of the penis. The inside of the urethra has a spiral groove (like rifling in a gun barrel), which makes the urine flow in a wide stream. The penis (plural penises, penes) is an external male sexual organ. ...
Rifling of a Canon de 75 modèle 1897 A 35 caliber Remington, with a microgroove rifled barrel with a right hand twist. ...
The urethra is divided into four parts in men, named after the location:
The length of a male's urethra, and the fact it contains a number of bends, makes catheterisation more difficult. This article is about the epithelium as it relates to animal anatomy. ...
In zootomy, epithelium is a tissue composed of a layer of cells. ...
The prostatic urethra, the widest and most dilatable part of the canal, is about 3 cm. ...
Male Anatomy The prostate is a gland that is part of male mammalian sex organs. ...
A spermatozoon or spermatozoan ( spermatozoa), from the ancient Greek σπÎÏμα (seed) and (living being) and more commonly known as a sperm cell, is the haploid cell that is the male gamete. ...
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. ...
The Ejaculatory ducts are part of the human male anatomy, which cause the reflex action of ejaculation. ...
The prostatic ducts (or prostatic ductules) open into the floor of the prostatic portion of the urethra, and are lined by two layers of epithelium, the inner layer consisting of columnar and the outer of small cubical cells. ...
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. ...
Transitional were a post punk band with riot grrl and new wave influences. ...
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. ...
In mammals the flow of urine from the urinary bladder is controlled by a group of muscles collectively called the urethral sphincter, named for their proximity to the urethra. ...
The deep perineal pouch (also deep perineal space) is an anatomical term that refers to the partially enclosed space in the perineum, located superiorly to the perineal membrane. ...
Male Anatomy In the anatomy of the male human body, the bulbourethral glands (or Cowpers glands) are two small, rounded, and somewhat lobulated bodies, of a yellow color, about the size of peas, placed behind and lateral to the membranous portion of the urethra, between the two layers of...
Transverse section of tracheal tissue. ...
The spongy urethra (cavernous portion of urethra, penile urethra) is the longest part of the urethra, and is contained in the corpus cavernosum urethraeæ. It is about 15 cm. ...
Corpus spongiosum (Plural: Corpora Spongiosa) is the mass of spongy tissue surrounding the male urethra within the penis. ...
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. ...
Transverse section of tracheal tissue. ...
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Catheter disassembled In medicine, a catheter is a tube that can be inserted into a body cavity, duct or vessel. ...
Histology The epithelium of the urethra starts off as transitional cells as it exits the bladder. Further along the urethra there are stratified columnar cells, then stratified squamous cells near the external meatus (exit hole). This article is about the epithelium as it relates to animal anatomy. ...
Transitional epithelia are multi-layered cells that can contract and expand. ...
Stratified columnar epithelia have several layers, with columnar cells as the outermost of these. ...
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External urethral orifice can refer to: External urethral orifice (female) External urethral orifice (male) Category: ...
There are small mucus-secreting urethral glands, that help protect the epithelium from the corrosive urine. Mucus cells. ...
Medical problems of the urethra - Hypospadias and epispadias are forms of abnormal development of the urethra in the male, where the meatus is not located at the distal end of the penis (it occurs lower than normal with hypospadias, and higher with epispadias). In a severe chordee, the urethra can develop between the penis and the scrotum.
- Infection of the urethra is urethritis, said to be more common in females than males. Urethritis is a common cause of dysuria (pain when urinating).
- Related to urethritis is so called urethral syndrome
- Passage of kidney stones through the urethra can be painful and subsequently it can lead to urethral strictures.
Endoscopy of the bladder via the urethra is called cystoscopy. Hypospadias is a birth defect of the urethra in the male that involves an abnormally placed urethral meatus (opening). ...
Hypospadias is a birth defect of the urethra in the male that involves an abnormally placed urethral meatus (opening). ...
The urinary meatus is the external orifice of the urethra, from which urine is ejected during urination. ...
In zootomy, several terms are used to describe the location of organs and other structures in the body of bilateral animals. ...
Chordee is a condition in which the penis curves downward (that is, in a ventral direction)or upward. ...
In some male mammals the scrotum is a protuberance of skin and muscle containing the testicles. ...
Urethritis is inflammation of the urethra. ...
In medicine, specifically urology, dysuria refers to any difficulty in urination. ...
Urethral syndrome is defined as symptoms suggestive of a lower tract urinary infection but in the absence of significant bacteruria with a conventional pathogen. ...
“Bladder stone†redirects here. ...
A sterile flexible cystoscope in an operating theatre Hello this is a Message to Dad Quit Reading this stuff :) . Endoscopy of the urinary bladder via the urethra is called cystoscopy. ...
Sexual physiology The male urethra is the conduit for semen during sexual intercourse. It also serves as a passage for urine to flow. It has been suggested that Duration of sexual intercourse be merged into this article or section. ...
See also A perineal urethra is a human urethral opening that is located on the perineum rather than at the tip of the phallus. ...
Vulvovaginal health is the health and sanitation of the human female vulva and vagina. ...
Female internal reproductive anatomy The urethral sponge is a spongy cushion of tissue, found in the lower genital area of women, that sits against both the pubic bone and vaginal wall, and surrounds the urethra. ...
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This article or section does not adequately cite its references or sources. ...
Subincision is a form of body modification consisting of a urethrotomy, in which the underside of the penis is incised and the urethra slit open lengthwise, from the urethral opening (meatus) toward the base. ...
The external urethral orifice (urinary meatus) is placed about 2. ...
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. ...
Additional images Urinary system Image File history File links Illu_urinary_system. ...
| Muscles of the female perineum. Image File history File links Gray408. ...
| Transverse section of the penis. Image File history File links Gray1155. ...
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External links | Anatomy: urinary system | | Abdomen | Kidneys • Ureters • Orifice of ureter | | Pelvis | Urinary bladder (Uvula, Trigone, Detrusor, Apex, Neck) Urethral sphincters (External sphincter muscle of male urethra, External sphincter muscle of female urethra, Internal sphincter muscle of urethra) The University of Kansas (often referred to as KU or just Kansas) is an institution of higher learning in Lawrence, Kansas. ...
List of bones of the human skeleton Human anatomy is primarily the scientific study of the morphology of the adult human body. ...
The urinary system is the organ system that produces, stores, and eliminates urine. ...
The kidneys are the organs that filter wastes (such as urea) from the blood and excrete them, along with water, as urine. ...
Transverse section of ureter. ...
The orifices of the ureters are placed at the postero-lateral angles of the trigonum vesicae, and are usually slit-like in form. ...
This article is about the urinary bladder. ...
The mucous membrane immediately behind the internal urethral orifice presents a slight elevation, the uvula of urinary bladder, caused by the middle lobe of the prostate. ...
The trigone is a smooth triangular region of the internal urinary bladder formed by the two ureteral orifices and the internal urethral orifice. ...
The detrusor urinae muscle is a muscle of the urinary bladder wall. ...
In mammals the flow of urine from the urinary bladder is controlled by a group of muscles collectively called the urethral sphincter, named for their proximity to the urethra. ...
The internal sphincter muscle of urethra is a muscle which constricts the internal urethral orifice in males. ...
Urethra | | Development | Development of the urinary and reproductive organs | | Male reproductive system | | Scrotum | layers (skin, Dartos, External spermatic fascia, Cremaster/Cremasteric fascia, Internal spermatic fascia) • Perineal raphe • Spermatic cord | | Testes | layers (Tunica vaginalis, Tunica albuginea, Tunica vasculosa testis) • Appendix • Mediastinum • Lobules • Septa • Leydig cell • Sertoli cell • Blood-testis barrier | | Spermatogenesis | Spermatogonium • Spermatocytogenesis • Spermatocyte • Spermatidogenesis • Spermatid • Spermiogenesis • Spermatozoon | | seminal tract | Seminiferous tubules (Tubuli seminiferi recti, Rete testis, Efferent ducts) • Epididymis (Appendix) • Vas deferens (Ampulla) • Ejaculatory duct | | urinary tract | Internal urethral orifice • Urethra (Prostatic, Intermediate, Spongy, Navicular fossa) • External urethral orifice | | accessory glands | Seminal vesicles (Excretory duct of seminal gland) • Prostate (Urethral crest/Seminal colliculus/Prostatic utricle/Ejaculatory duct, Prostatic sinus/Prostatic ducts) • Bulbourethral glands | | Penis | root (Crus, Bulb, Fundiform ligament, Suspensory ligament) • body (Corpus cavernosum, Corpus spongiosum) • glans (Foreskin, Frenulum, Corona) • fascia (superficial/subcutaneous, deep/Buck's) • Tunica albuginea - Septum of the penis | Human development may refer to: Human development (biology) Human development (psychology) see Developmental psychology Occasionally, it may refer to both, but because each of these is already an immense area, few if any contemporary academic discussions attempt to tackle both with any completeness. ...
In prenatal development, the urinary and reproductive organs are developed from the intermediate mesoderm. ...
This article is about human male reproductive system. ...
A pictorial illustration of the human female reproductive system. ...
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. ...
As the cremaster descends, it forms a series of loops which differ in thickness and length in different subjects. ...
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. ...
Look up testes in Wiktionary, the free dictionary. ...
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For other structures with the same name, see Tunica albuginea. ...
The Appendix testis is a vestigial remnant of the Müllerian 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 σπÎÏμα (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 vas deferens (plural: vasa deferentia), also called ductus deferens, (Latin: carrying-away vessel) is part of the male anatomy of some species, including humans. ...
At the fundus of the bladder the ductus deferens becomes enlarged and tortuous, and this portion is termed the ampulla. ...
The Ejaculatory ducts are part of the human male anatomy, which cause the reflex action of ejaculation. ...
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. ...
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 urethraeæ. It is about 15 cm. ...
The cavernous portion of the urethra is narrow, and of uniform size in the body of the penis, measuring about 6 mm. ...
Nathan J. Youngers favorite peice of candy to suck on. ...
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. ...
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. ...
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 introduction to this article provides insufficient context for those unfamiliar with the subject matter. ...
The Ejaculatory ducts are part of the human male anatomy, which cause the reflex action of ejaculation. ...
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. ...
The prostatic ducts (or prostatic ductules) open into the floor of the prostatic portion of the urethra, and are lined by two layers of epithelium, the inner layer consisting of columnar and the outer of small cubical cells. ...
A bulbourethral gland (or Cowpers gland) is one of two small exocrine glands present in the reproductive system of human males. ...
The penis (plural penises, penes) is an external male sexual organ. ...
The root of the penis is triradiate in form, consisting of the diverging crura, one on either side, and the median urethral bulb. ...
For their anterior three-fourths the corpora cavernosa penis lie in intimate apposition with one another, but behind they diverge in the form of two tapering processes, known as the crura, which are firmly connected to the rami of the pubic arch. ...
Just before each crus of the penis meets its fellow it presents a slight enlargement, named by Kobelt the bulb of the corpus cavernosum 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 body of the penis extends from the root to the ends of the corpora cavernosa penis, and in it these corpora cavernosa are intimately bound to one another. ...
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 glans penis (or simply glans) is the sensitive tip of the penis. ...
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. ...
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 circumference of the base of the glans forms a rounded projecting border, the corona of the glans penis, overhanging a deep retroglandular sulcus, behind which is the neck of the penis. ...
Fascia is specialized connective tissue layer which surrounds muscles, bones, and joints, providing support and protection and giving structure to the body. ...
The subcutaneous tissue of penis (or superficial penile fascia) is continuous above with the fascia of Scarpa, and below with the dartos tunic of the scrotum and the fascia of Colles. ...
Bucks fascia is a layer of deep fascia covering the penis. ...
The fibrous envelope of the corpus cavernosum urethræ (or tunica albuginea) is thinner, whiter in color, and more elastic than that of the corpora cavernosa penis. ...
The corpora cavernosa penis are surrounded by a strong fibrous envelope consisting of superficial and deep fibers. ...
Image File history File links Question_book-3. ...
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