Internal urethral sphincter
Internal urethral sphincter
Urethral sphincter muscle which constricts the internal urethral orifice.
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Readers' pathsAug 2026 – Oct 2026
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External sphincter muscle of male urethra
Muscle of the human male urethra.
20%
Urethral sphincters
Muscles keeping urine in the bladder.
17%
Paruresis
Inability to urinate in the presence of others.
15%
Detrusor muscle
Muscle of the bladder that expels urine.
12%
Retrograde ejaculation
Redirection of ejaculated semen into the urinary bladder.
9.8%
Urination
Release of urine from the urinary bladder.
9.4%
External sphincter muscle of female urethra
Muscle of the human female urethra.
5.5%
Bladder
Organ in vertebrates that collects and stores urine from the kidneys before disposal.
2%
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Urethral sphincters
Muscles keeping urine in the bladder.
31%
Ejaculation
Semen discharge from the male reproductive tract.
23%
Retrograde ejaculation
Redirection of ejaculated semen into the urinary bladder.
13%
Urethra
Tube that connects the urinary bladder to the external urethral orifice.
8.7%
External sphincter muscle of male urethra
Muscle of the human male urethra.
8.6%
External sphincter muscle of female urethra
Muscle of the human female urethra.
8.4%
Detrusor muscle
Muscle of the bladder that expels urine.
4.7%
Urination
Release of urine from the urinary bladder.
2.9%