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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 ...
The muscle helps maintain continence of urine along with the internal urethral sphincter which is under control of the autonomic nervous system.The external sphincter muscle prevents urine leakage as the muscle is tonically contracted via somatic fibers that originate in Onuf's nucleus and pass through sacral spinal nerves S2-S4 then the pudendal nerve to synapse on the muscle.
The urethra (pl.: urethras or urethrae) is the tube that connects the urinary bladder to the urinary meatus, [1] [2] through which placental mammals urinate and ejaculate. [3] In non-mammalian vertebrates, the urethra also transports semen but is separate from the urinary tract.
Lateral anatomical view of the female reproductive system. The female external urethral orifice is where urine exits the urethra during urination.It is located about 2.5 cm (1 in) behind the clitoris and immediately in front of the vaginal opening in the vulval vestibule.
However, the terms "ureter" and "urethra" were variably used to refer to each other thereafter for more than a millennium. [29] It was only in the 1550s that anatomists such as Bartolomeo Eustachi and Jacques Dubois began to use the terms to specifically and consistently refer to what are in modern English called the ureter and the urethra. [29]
Unlike the urinary bladder of vertebrates, the urinary bladder of crustaceans both stores and modifies urine. [50] The bladder consists of two sets of lateral and central lobes. The central lobes sit near the digestive organs and the lateral lobes extend along the front and sides of the crustacean's body cavity. [50]
The anatomical variation in membranous urethral length measurements in men have been reported to range from 0.5 cm to 3.4 cm. [citation needed] The membranous portion of the urethra is surrounded by the fibers of the sphincter urethrae membranaceae .
The genitourinary system, or urogenital system, are the sex organs of the reproductive system and the organs of the urinary system. [1] These are grouped together because of their proximity to each other, their common embryological origin and the use of common pathways. Because of this, the systems are sometimes imaged together. [2]