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  2. Urethral sphincters - Wikipedia

    en.wikipedia.org/wiki/Urethral_sphincters

    The female or male external sphincter muscle of urethra (sphincter urethrae): located in the deep perineal pouch, at the bladder's distal inferior end in females, and inferior to the prostate (at the level of the membranous urethra) in males. It is a secondary sphincter to control the flow of urine through the urethra.

  3. External sphincter muscle of male urethra - Wikipedia

    en.wikipedia.org/wiki/External_sphincter_muscle...

    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.

  4. Urethra - Wikipedia

    en.wikipedia.org/wiki/Urethra

    The external urethral sphincter is a striated muscle that allows voluntary control over urination. [5] The internal sphincter, formed by the involuntary smooth muscles lining the bladder neck and urethra, receives its nerve supply by the sympathetic division of the autonomic nervous system. [6] The internal sphincter is present both in males ...

  5. Internal urethral sphincter - Wikipedia

    en.wikipedia.org/wiki/Internal_urethral_sphincter

    The internal urethral sphincter is a urethral sphincter muscle which constricts the internal urethral orifice. It is located at the junction of the urethra with the urinary bladder and is continuous with the detrusor muscle , [ 1 ] [ 2 ] but anatomically and functionally fully independent from it. [ 3 ]

  6. Urination - Wikipedia

    en.wikipedia.org/wiki/Urination

    A male Patagonian mara, a type of rodent, will stand on his hind legs and urinate on a female's rump, to which the female may respond by spraying a jet of urine backwards into the face of the male. [70] The male's urination is meant to repel other males from his partner while the female's urination is a rejection of any approaching male when ...

  7. Urinary system - Wikipedia

    en.wikipedia.org/wiki/Urinary_system

    Conditions involving low output of urine are oliguria (< 400 mL/day) and anuria (< 100 mL/day). The first step in urine formation is the filtration of blood in the kidneys. In a healthy human, the kidney receives between 12 and 30% of cardiac output , but it averages about 20% or about 1.25 L/min.

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