urethra

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urethra

(yo͝orē`thrə), canal in most mammals that carries urine from the bladderbladder, urinary,
muscular sac located in the pelvis that stores urine and contracts to expel it from the body. Urine enters the bladder from the kidneys through the ureters and is discharged from the body via the urethra. The bladder of the adult human can hold over a pint (0.
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 to the outside of the body; in the male it also serves as a genital duct. The urethra is about 1 1-2 in. long (3.8 cm) in women, terminating above the vaginal opening. In men the urethra is about 8 in. (20 cm) long and terminates in an opening at the end of the penis. In the male the urethra is connected to the prostate glandprostate gland,
gland that is part of the male reproductive system. It is an organ about the size of a chestnut and consists of glandular and muscular tissue. It is situated below the neck of the bladder, encircling the urethra.
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 and to the seminal vesicles and testes. It transports semen received from those organs as well as urine. See also urinary systemurinary system,
group of organs of the body concerned with excretion of urine, that is, water and the waste products of metabolism. In humans, the kidneys are two small organs situated near the vertebral column at the small of the back, the left lying somewhat higher than the
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.

Urethra

 

the terminal section of the urinary tract in some invertebrates, in all vertebrates, and in man. The urethra is a tube whose wall consists of an internal mucous membrane, a muscular membrane, and a connective tissue membrane.

In males the urethra emerges from the urinary bladder, descends through the prostate gland, passes between the two layers of the urogenital diaphragm under the pubic arch, enters the corpus spongiosum of the penis, and opens to the exterior of the body at the tip of the penis. The male urethra is about 20 cm long and about 7 mm in diameter. In females the urethra is much shorter—about 5 cm—and follows an almost straight path that ends in an external opening in the vestibule of the vagina. The section of the urethra that emerges from the urinary bladder is surrounded by a sphincter—a ring-shaped constrictor muscle.

The walls of the empty urethra are normally touching, becoming distended only during urination. In males the orifices of the deferent ducts and of the prostate gland open into the urethra at the point where the urethra passes through the prostate; thus, both urine and semen are expelled through the male urethra. The mucous membrane of the urethra contains glands. Inflammatory processes in the urethra can result in constriction caused by scarring, a condition that requires surgical treatment.

urethra

[yə′rē·thrə]
(anatomy)
The canal in most mammals through which urine is discharged from the urinary bladder to the outside.

urethra

the canal that in most mammals conveys urine from the bladder out of the body. In human males it also conveys semen
References in periodicals archive ?
With these images, we suggested a complex urogenital malformation associating a uterus didelphys and a urethral duplicity: the main urethra communicating with the vagina by the persistence of the urogenital sinus opening externally via the orifice below the cyst; the accessory phallic urethra opens externally to the vulva via a voluminous cyst with an orifice at its anterosuperior surface and emitting urine intermittently.
A multistep surgical management was proposed, the first consisting of an excision of the phallic accessory urethra with resection of the cyst and a vaginoplasty, thus allowing a complete separation of the urinary tract of the genital structures (Figures 6(a) and 6(b)): the repair of the malformations of the left lower limb having been deferred.
The urethral catheterization of miniature pig has become a common technique in scientific research.[sup][3] Since there are three acute angles bending in the urethra of the male miniature pigs, and the end of the penis head is cork-screw shaped, it is difficult to implement routine urethral catheterization.[sup][4] The perineum structure of female miniature pig is special, but it is difficult to expose the urethra, so researchers usually abandon routine urethral catheterization as they cannot locate the urethra and further implement invasive bladder colostomy or centesis.
(1) As the urethra of a female miniature pig is located deep in the vaginal vestibule, we needed to enter the vaginal vestibule to see the vaginal orifice, which can be considered as an anatomical location marker, and the urethra is hidden in the vertical folds above the vaginal orifice, while the other longitudinal folds are all blind ends.
"Totally grown in the laboratory, these urethras, living tubes which convey urine from the bladder, highlight the power of cell-based therapies," the BBC quoted Professor Chris Mason, an expert on regenerative medicine at University College London, as saying.
Lemack explained: an inability to hold urine because of bladder spasticity, an inability to hold urine because of weakness in the urethra or surrounding muscles, and an inability to completely empty the bladder, which can lead to overflow.
Your urinary tract includes two kidneys, two ureters, the bladder and the urethra. Your kidneys remove waste and water from your blood to produce urine.
Infection isn't sexually transmitted but frequent intercourse, especially with a new partner, can bring on an attack if the urethra gets bruised.
If your son has his first UTI and he admits to injecting water into his urethra, further studies may not be necessary.
During surgery, both urethras were catheterized with 8-Fr catheters and filled with saline to demonstrate the megalourethras (Figure 4a, 4b).
The firearm fragment injuries were made to the bulbous urethra of 10 New Zealand male rabbits.
Most UTIs strike the lower part of the urinary tract, the bladder and urethra, because bacteria from the bowel can travel up the urethra to the bladder.