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  2. Urethral sphincters - Wikipedia

    en.wikipedia.org/wiki/Urethral_sphincters

    In males, the internal urethral sphincter has the additional function of preventing the flow of semen into the male bladder during ejaculation. [3] Females do have a more elaborate external sphincter muscle than males as it is made up of three parts: the sphincter urethrae, the urethrovaginal muscle, and the compressor urethrae.

  3. External sphincter muscle of female 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. Vaginal support structures - Wikipedia

    en.wikipedia.org/wiki/Vaginal_support_structures

    The perineum attaches across the gap between the inferior pubic rami bilaterally and the perineal body. This grouping of muscles constricts to close the urogenital openings. The perineum supports and functions as a sphincter at the opening of the vagina. Other structures exist below the perineum that support the anus. [3] [6]

  7. Deep perineal pouch - Wikipedia

    en.wikipedia.org/wiki/Deep_perineal_pouch

    Compressor urethrae muscle in the female is sometimes included [3] Urethrovaginal sphincter in the female is sometimes included [3] other Membranous urethra in the male; proximal portion of urethra in the female; Bulbourethral gland (males). The Bartholin gland, the female counterpart, is in the superficial perineal pouch; Vagina (females)

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