urinary bladder

Anat., Zool.
a distensible, muscular and membranous sac, in which the urine is retained until it is discharged from the body. Also called bladder.
[1720-30]

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▪ human anatomy
 in most vertebrates, except birds, organ for the temporary storage of urine from the kidneys (kidney), connected to the kidneys by means of tubular structures called ureters (ureter). A urinary bladder is present in fish as an expansible part of the urinary duct, in amphibians and bladder-possessing reptiles (Sphenodon, turtles, most lizards) as a pocket in the cloaca. In mammals it is a greatly expandible muscular sac. The bladder of an average adult human is uncomfortably distended at a volume of around 350 millilitres (1/3 quart) of urine.

      In placental mammals a special duct, the urethra, leads from the urinary bladder to the exterior; it fulfills the excretory function of the more primitive cloaca. In females the urethra is separate from the genital tract. In males the vas deferens (sperm-carrying tubes) empty into the urethra, and both urine and semen pass through the urethra to reach the exterior.

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Universalium. 2010.

Look at other dictionaries:

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  • urinary bladder — n. a saclike structure in many animals, serving for temporary storage of fluid or semifluid excretions, as urine …   English World dictionary

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  • urinary bladder — bladder that secretes and discharges urine …   English contemporary dictionary

  • urinary bladder — noun An elastic, muscular sac situated in the pelvic cavity, into which urine from the kidneys is stored prior to disposal by urination. Urine enters the bladder via the ureters and exits via the urethra. Syn: bladder, cystis urinaria, vesica,… …   Wiktionary

  • urinary bladder — a small vesicle at the posteriormost, ventral part of the body cavity. In females the bladder is combined with the oviducts to form a urogenital sinus …   Dictionary of ichthyology

  • urinary bladder — see bladder …   The new mediacal dictionary

  • urinary bladder — u′rinary blad′der n. anat. zool. a distensible, muscular sac in most vertebrates, in which urine is retained until discharged from the body Also called bladder 1), b) • Etymology: 1720–30 …   From formal English to slang

  • urinary bladder — noun Date: 1728 a membranous sac in many vertebrates that serves for the temporary retention of urine and discharges by the urethra …   New Collegiate Dictionary

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