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Topic: Urethra


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  XI. Splanchnology. 3b. 4. The Male Urethra. Gray, Henry. 1918. Anatomy of the Human Body.
Upon the posterior wall or floor is a narrow longitudinal ridge, the urethral crest (verumontanum), formed by an elevation of the mucous membrane and its subjacent tissue.
The lining membrane of the urethra, especially on the floor of the cavernous portion, presents the orifices of numerous mucous glands and follicles situated in the submucous tissue, and named the urethral glands (Littré).
In more severe cases the cavernous portion of the urethra is cleft throughout its entire length, and the opening of the urethra is at the point of junction of the penis and scrotum.
www.bartleby.com /107/256.html   (1536 words)

  
 eMedicine - Urethra, Trauma : Article Excerpt by: J Kevin Smith, MD, PhD
The posterior urethra, however, is firmly attached to the pubic arch by the perineal membrane.
Anterior urethral injuries are seen in a small minority of patients because of the mobility of the anterior urethra compared with the posterior urethra.
Force from the structure on the perineum compresses the corpora spongiosum and bulbous urethra against the pubic symphysis, disrupting the urethra.
www.emedicine.com /radio/byname/urethra-trauma.htm   (629 words)

  
  Urethra
In anatomy, the urethra is a tube that 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 sperm.
Hypospadias is a form of abnormal development of the urethra in the male, where the opening is not quite where it should be (it occurs lower than normal in hypospadias).
publicliterature.org /en/wikipedia/u/ur/urethra.html   (495 words)

  
 Dorlands Medical Dictionary
In the female it may open in the vestibule, terminal urethra, vagina, cervix, or uterine cavity; in the male it invariably enters the genital or urinary tract above the level of the external sphincter.
deformity of the urethra upon urination, with narrowing at the urinary meatus and dilatation at the proximal end; seen sporadically in conditions such as prolonged inflammation of the urethra and detrusor instability.
(u-re”thro-re´ə) [urethro- + -rrhea] an abnormal discharge from the urethra.
www.mercksource.com /pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszSzuszSzcommonzSzdorlandszSzdorlandzSzdmd_u_03zPzhtm   (3201 words)

  
 Urethra at AllExperts
In anatomy, the urethra 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 sperm.
The male urethra is well-known as the conduit for sperm during sexual intercourse.
en.allexperts.com /e/u/ur/urethra.htm   (515 words)

  
 Human Anatomy & Physiology   (Site not responding. Last check: )
The final passageway for the flow of urine is the urethra, a thin-walled tube that conveys urine from the floor of the urinary bladder to the outside.
In males, the urethra is much longer, about 20 cm (7 to 8 inches) in length, and transports both urine and semen.
This portion of the urethra extends the entire length of the penis, and the external urethral orifice opens to the outside at the tip of the penis.
www.free-ed.net /sweethaven/Science/Biology/AnatomyPhysiol/Human01_LessonMain.asp?iNum=1106   (236 words)

  
 [No title]   (Site not responding. Last check: )
The posterior or deep portion of the urethra is 4 - 6cm in length, and involves both the prostatic urethra and the membranous urethra.
Because of this the membranous urethra is most susceptible to rupture or tears during the stress produced by a pelvic fracture.
The posterior urethra may be triangular in appearance secondary to the absence of the posterior lobe of the prostate.
lycos.com /info/urethra--prostate.html   (470 words)

  
 Urethral cancer
Superficial tumors located in the anterior urethra of both the female and male are generally curable; deeply invasive lesions or those lesions located in the posterior urethra, because they are almost always deeply invasive, are rarely curable by any combinations of therapy.
The male urethra is lined by transitional cells in its prostatic and membranous portion and stratified columnar epithelium to stratified squamous epithelium in the bulbous and penile portions.
Since transitional cell carcinoma of the prostatic urethra is usually associated with transitional cell carcinoma of the bladder and/or transitional cell carcinoma arising in prostatic ducts, it is treated according to the guidelines for treatment of these primaries and should be separated from the more distal carcinomas of the urethra.
www.meds.com /pdq/urethral_pro.html   (1998 words)

  
 urethra
The final passageway for the flow of urine is the urethra, a thin-walled tube that conveys urine from the floor of the urinary bladder to the outside.
In males, the urethra is much longer, about 20 cm (7 to 8 inches) in length, and transports both urine and semen.
This portion of the urethra extends the entire length of the penis, and the external urethral orifice opens to the outside at the tip of the penis.
www.daviddarling.info /encyclopedia/U/urethra.html   (311 words)

  
 Chapter 33: The ureter, bladder and urethra
The urethra is a fibromuscular tube that conducts urine from the bladder (and semen from the ductus deferens) to the exterior.
The two bulbourethral glands (which are situated bilaterally in the sphincter urethrae and behind the membranous urethra) open into the proximal portion of the spongy urethra.
The interior of the urethra may be viewed in vivo by an electrically lit instrument termed a urethroscope.
www.dartmouth.edu /~humananatomy/part_6/chapter_33.html   (1679 words)

  
 Urethral Stricture Disease: urethra stricture narrowing reconstruction, frequent urination   (Site not responding. Last check: )
Urethral stricture disease involves the blockage or narrowing of the urethra which causes the restriction of urine flow from the bladder during the process of urination.
The most common causes of urethral strictures in the United States include previous trauma or instrumentation of the urethra, infection involving the urethra (gonorrhea), congenital (born with a stricture), cancer of the urethra, idiopathic (unknown), and from balanitis xerotica obliterans (BXO).
The posterior or deep portion of the urethra is 4 - 6cm in length, and involves both the prostatic urethra and the membranous urethra.
urology.northwestern.edu /nmffurology/urethralstricture.html   (979 words)

  
 Center for Reconstructive Urology: Urethral Stricture Disease   (Site not responding. Last check: )
Stricture disease of the posterior urethra is often caused by a urethral injury associated with a pelvic fracture, such as an automobile or industrial accident.
As the urine travels further toward the penis, it enters the bulbar urethra, the portion of the urethra between the sphincter area and the base of the penis (the portion of the penis that joins the scrotum and the abdomen).
The stent is placed endoscopically and holds the strictured portion of the urethra open as it heals after surgery (preventing the normal scar formation of healing from causing the stricture to recur).
www.urethralstricture.com /us_pf.html   (1624 words)

  
 6. Urethra   (Site not responding. Last check: )
The urethra of a male can be divided into two sections - the internal, or pelvic section, and the external, or spongy section.
The mucous membrane of the urethra is surrounded by cavernous erectile tissue - the Cavernous Layer.
The layer of cavernous erectile tissue is thin around the pelvic part of the urethra, but much greater in size outside the pelvis, where it becomes known as the Spongiose body of the penis.
d-mis-web.ana.bris.ac.uk /calnet/pot60_01/page6.htm   (260 words)

  
 XI. Splanchnology. 3b. 5. The Female Urethra. Gray, Henry. 1918. Anatomy of the Human Body.
The lining membrane is thrown into longitudinal folds, one of which, placed along the floor of the canal, is termed the urethral crest.
In addition to this, between the superior and inferior fasciæ of the urogenital diaphragm, the female urethra is surrounded by the Sphincter urethræ membranaceæ, as in the male.
A thin layer of spongy erectile tissue, containing a plexus of large veins, intermixed with bundles of unstriped muscular fibers, lies immediately beneath the mucous coat.
www.bartleby.com /107/257.html   (307 words)

  
 eMedicine - Urethra, Trauma : Article by J Kevin Smith, MD, PhD
The prostatic urethra is entirely contained within the prostate and is continuous with the membranous urethra at the prostatic apex inferiorly.
The membranous urethra is located within the anterior tip of the urogenital diaphragm and becomes the proximal portion of the anterior urethra after passing through the perineal membrane.
The bulbous urethra, a swelling in the proximal anterior section, travels within the proximal corpus spongiosum and is continuous with the penile urethra.
www.emedicine.com /radio/topic733.htm   (5006 words)

  
 Carcinoma of the Urethra   (Site not responding. Last check: )
The lymphatic drainage of the distal urethra and labia is to the superficial and deep inguinal nodes.
The proximal urethra drains to the nodes of the iliac, obturator, presacral, and para-aortic lymphatic chains.
Tumors of the fossa and pendulous urethra drain to the superficial inguinal lymph nodes, while tumors of the bulbar, membranous, and prostatic urethral segments drain to the iliac, obturator, and presacral node groups.
www.health.am /cr/urethral-carcinoma   (2585 words)

  
 Urethral Stricture
A urethral stricture is a scar in or around the urethra, which is the tube that drains urine from the bladder.
Gonorrhea infection of the urethra used to be the most common cause of urethral strictures.
Urethra strictures are often opened up by inserting catheters, with or without balloons on the end, into the urethra.
www.drrajmd.com /conditions/treatments/urethral_stricture.htm   (844 words)

  
 Stricture Urethra   (Site not responding. Last check: )
Stricture urethra is an abnormal narrowing of the urethra.
It may also be caused by external pressure from an enlarging tumour near the urethra although this condition is rare.
It is a procedure adopted to stretch the urethra by inserting a thin instrument.
www.homeomiracles.com /Index/kidney/kidney_article/Stricture_Urethra/Stricture%20Urethra.html   (423 words)

  
 The Straight Dope: Can the candirĂº fish swim upstream into your urethra (revisited)?
The fish penetrated the victim's urethra while he was standing in the river urinating, actually emerging from the water and entering his penis, filling the entire anterior urethra [emphasis added].
The candirĂº's forward progress was blocked by the sphincter separating the penile urethra from the bulbar urethra.
Perfusion [flushing] of the urethra with sterile distilled water prior to endoscopy induced further immediate and pronounced scrotal edema, making it evident that the opening had allowed the perfusate to enter the scrotum.
www.straightdope.com /columns/010907.html   (916 words)

  
 The Straight Dope: Can the candiru fish swim upstream into your urethra?
One of the strangest [stories from the Amazon concerned] a fish that was urinophilic and could swim up the urethra or into the vagina of the unwary native who urinated while bathing in the Amazon.
It was also said that even if one caught the fish by the tail, once in the urethra it could not be pulled out because it would spread itself like an umbrella.
Indeed, rumors had it that penectomy was preferred to the misery and pain associated with leaving the fish in the urethra!
www.straightdope.com /columns/000519.html   (1042 words)

  
 Urethral Cancer - urologychannel
The urethra is the structure that carries urine, and in men, semen from the body.
In women, the urethra is lined with transitional cells near the urethral opening and squamous cells near the bladder.
Cancer that develops in the posterior portion of the urethra (i.e., near the bladder) is usually invasive and rarely curable.
www.urologychannel.com /urethralcancer   (427 words)

  
 urethra - Encyclopedia.com
urethra, canal in most mammals that carries urine from the bladder to the outside of the body; in the male it also serves as a genital duct.
In men the urethra is about 8 in.
In the male the urethra is connected to the prostate gland and to the seminal vesicles and testes.
www.encyclopedia.com /doc/1E1-urethra.html   (406 words)

  
 urethra
The urethra is the tube that carries urine from the urinary bladder to the outside.
In females the urethra is relatively wide, short and straight, and has a strictly urinary function.
In males the urethra is relatively narrow, long and curved, and has both urinary and reproductive functions.
www.ndsu.nodak.edu /instruct/tcolvill/135/urethra.htm   (48 words)

  
 Double Urethra - DrGreene.com
In dorsal duplications of the urethra, a normal urethra follows the usual channel and ends in a normal hole at the tip of the penis.
The opening from the second urethra is often located on the underside of the penis (and is thus less visible than in the dorsal variety), but it can appear further down, even as far away as the anterior rim of the anus.
Perianal urethras should be repaired; the surgery is complicated and usually involves trying to move that urethra forward.
www.drgreene.com /21_801.html   (1009 words)

  
 urethra - Search Results - MSN Encarta
anatomy of urethra, diseases and disorders of urethra, function of urethra, illustrations, treatment of urinary system disorders
Cystitis, in medicine, inflammation of the urinary bladder, usually from bacterial infection originating in the urethra, vagina, or, in more...
Prostate Gland, chestnut-shaped male organ located next to the bladder and surrounding the urethra (the tube that carries urine from the bladder to...
ca.encarta.msn.com /urethra.html   (97 words)

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