Editing Urinary system (section)

==Structure== 
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[[File:3DPX-002331 Urinary collecting system 3DFile.stl|thumb|3D model of urinary system]]
The urinary system refers to the structures that produce and transport urine to the point of excretion. In the human urinary system there are two kidneys that are located between the dorsal body wall and parietal peritoneum on both the left and right sides. 

The formation of urine begins within the functional unit of the kidney, the nephrons. Urine then flows through the nephrons, through a system of converging tubules called collecting ducts. These collecting ducts then join to form the [[Renal calyx|minor calyces]], followed by the major calyces that ultimately join the renal pelvis. From here, urine continues its flow from the renal pelvis into the ureter, transporting urine into the urinary bladder. The anatomy of the human urinary system differs between males and females at the level of the urinary bladder. In males, the urethra begins at the internal urethral orifice in the trigone of the bladder, continues through the external urethral orifice, and then becomes the prostatic, membranous, bulbar, and penile urethra. Urine exits the male urethra through the [[urinary meatus]] in the [[glans penis]]. The female urethra is much shorter, beginning at the bladder neck and terminating in the [[vulval vestibule]].

===Development===
{{Main|Development of the urinary system}}

===Microanatomy===
{{See also|Urothelium}}

Under microscopy, the urinary system is covered in a unique lining called [[urothelium]], a type of [[transitional epithelium]]. Unlike the [[epithelium|epithelial]] lining of most organs, transitional epithelium can flatten and distend. Urothelium covers most of the urinary system, including the renal pelvis, ureters, and bladder.