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  2. 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]

  3. Urethral sphincters - Wikipedia

    en.wikipedia.org/wiki/Urethral_sphincters

    The internal sphincter muscle of urethra: located at the bladder's inferior end and the urethra's proximal end at the junction of the urethra with the urinary bladder. The internal sphincter is a continuation of the detrusor muscle and is made of smooth muscle, therefore it is under involuntary or autonomic control.

  4. Why You Can’t Pee With an Erection, According to Urologists

    www.aol.com/urologist-explains-pee-boner...

    The body is calm, the bladder muscles contract, and the internal sphincter, which is located at the opening between the bladder and urethra, opens, letting you pee.

  5. Internal urethral orifice - Wikipedia

    en.wikipedia.org/wiki/Internal_urethral_orifice

    The internal urethral orifice is the opening of the urinary bladder into the urethra. [1] Anatomy ... Internal sphincter muscle of urethra; References

  6. 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 ...

  7. Sphincter - Wikipedia

    en.wikipedia.org/wiki/Sphincter

    The sphincter urethrae, or urethral sphincter, controlling the exit of urine from the body. At the anus, there are two anal sphincters which control the exit of feces from the body, the internal anal sphincter and external anal sphincter. The inner sphincter is involuntary and the outer is voluntary.

  8. Urination - Wikipedia

    en.wikipedia.org/wiki/Urination

    During the storage phase, the internal urethral sphincter remains tense and the detrusor muscle relaxed by sympathetic stimulation. During micturition, parasympathetic stimulation causes the detrusor muscle to contract and the internal urethral sphincter to relax. The external urethral sphincter (sphincter urethrae) is under somatic control and ...

  9. Bladder - Wikipedia

    en.wikipedia.org/wiki/Bladder

    The neck of the bladder is the area at the base of the trigone that surrounds the internal urethral orifice that leads to the urethra. [5] In males, the neck of the urinary bladder is next to the prostate gland. The bladder has three openings. The two ureters enter the bladder at ureteric orifices, and the urethra enters at the trigone of the ...