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The bladder (from Old English blædre 'bladder, blister, pimple') is a hollow organ in humans and other vertebrates that stores urine from the kidneys. In placental mammals , urine enters the bladder via the ureters and exits via the urethra during urination .
This is an accepted version of this page This is the latest accepted revision, reviewed on 5 February 2025. This article is about the human urinary system. For urinary systems of other vertebrates, see Urinary systems of birds, urinary systems of reptiles, and urinary systems of amphibians. Anatomical system consisting of the kidneys, ureters, urinary bladder, and the urethra Urinary system 1 ...
Urology addresses diseases of kidney (and urinary tract) anatomy: these include cancer, renal cysts, kidney stones and ureteral stones, and urinary tract obstruction. [ 7 ] The word “ renal ” is an adjective meaning “relating to the kidneys”, and its roots are French or late Latin.
This illustration demonstrates the normal kidney physiology, including the Proximal Convoluted Tubule (PCT), Loop of Henle, and Distal Convoluted Tubule (DCT). It also includes illustrations showing where some types of diuretics act, and what they do. Renal physiology (Latin renes, "kidneys") is the study of the physiology of the kidney.
In the contracted bladder, they are about 25 mm (1 in) apart and about the same distance from the internal urethral orifice; in the distended bladder, these measurements may be increased to about 50 mm (2 in). [2] A number of structures pass by, above, and around the ureters on their path down from the kidneys to the bladder. [2]
In birds, the kidneys are typically elongated [79] and located dorsally in the abdominal cavity in the pelvic skeletal depressions. [80] [81] The structure of the avian kidneys differs from the structure of the mammalian kidneys. [67] The avian kidney is lobulated and usually consists of three lobes. [80]
The kidneys of the marine mammals, otters and bears are reniculate. [16] The reniculate kidneys consist of small reniculi, [16] each of which is comparable by its structure to a simple unipapillary kidney. [9] The kidneys of marine mammals can have hundreds [16] or thousands [49] of reniculi, each with its own cortex, medulla, and calyx. [16]
[citation needed] A large "staghorn" kidney stone may block all or part of the renal pelvis. The size of the renal pelvis plays a major role in the grading of hydronephrosis . Normally, the anteroposterior diameter of the renal pelvis is less than 4 mm in fetuses up to 32 weeks of gestational age and 7 mm afterwards. [ 2 ]