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  2. Urination - Wikipedia

    en.wikipedia.org/wiki/Urination

    Urination is the release of urine from the bladder to the outside of the body. Urine is released through the urethra and exits the penis or vulva through the urinary meatus in placental mammals, [1] [2]: 38, 364 but is released through the cloaca in other vertebrates.

  3. Urinary system - Wikipedia

    en.wikipedia.org/wiki/Urinary_system

    Following filtration of blood and further processing, wastes (in the form of urine) exit the kidney via the ureters, tubes made of smooth muscle fibres that propel urine towards the urinary bladder, where it is stored and subsequently expelled through the urethra during urination. The female and male urinary system are very similar, differing ...

  4. Onuf's nucleus - Wikipedia

    en.wikipedia.org/wiki/Onuf's_nucleus

    Onuf's nucleus is a distinct group of neurons located in the ventral part of the anterior horn of the sacral region of the human spinal cord involved in the maintenance of micturition and defecatory continence, as well as muscular contraction during orgasm. It contains motor neurons, and is the origin of the pudendal nerve.

  5. Detrusor muscle - Wikipedia

    en.wikipedia.org/wiki/Detrusor_muscle

    During urination, parasympathetic pelvic splanchnic nerves act primarily on postganglionic M 3 receptors to cause contraction of the detrusor muscle. [ 1 ] [ 2 ] [ 3 ] At other times, the muscle is kept relaxed via sympathetic branches from the inferior hypogastric plexus to allow the bladder to fill.

  6. Urethral sphincters - Wikipedia

    en.wikipedia.org/wiki/Urethral_sphincters

    This is the primary muscle for prohibiting urination. 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 ...

  7. Pontine micturition center - Wikipedia

    en.wikipedia.org/wiki/Pontine_micturition_center

    In neuroanatomy, the pontine micturition center (PMC, also known as Barrington's nucleus) is a collection of neuronal cell bodies located in the rostral pons in the brainstem involved in the supraspinal regulation of micturition (urination). When activated, the PMC relaxes the urethral sphincter, allowing for micturition

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  9. 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]