External sphincter muscle of urethra

The male urethra laid open on its anterior (upper) surface. (Region of external sphincter muscle of urethra labeled at center right.)

The External sphincter muscle of urethra is a muscle that surrounds the urethra and controls the release of urine from the body. It is a part of the urinary system and is located in the pelvic region of both males and females.

Structure

The external sphincter muscle of urethra is a circular muscle that surrounds the urethra. It is composed of striated muscle tissue, which allows for voluntary control over urination. This muscle is located below the internal sphincter muscle of urethra, which is composed of smooth muscle tissue and is under involuntary control.

Function

The primary function of the external sphincter muscle of urethra is to control the release of urine from the body. When the muscle is contracted, it prevents urine from passing through the urethra. When the muscle is relaxed, it allows urine to pass through the urethra and out of the body.

Clinical significance

Dysfunction of the external sphincter muscle of urethra can lead to urinary incontinence, a condition where an individual is unable to control the release of urine. This can be caused by a variety of factors, including nerve damage, muscle weakness, and certain medical conditions.

See also

• Urinary system
• Urethra
• Internal sphincter muscle of urethra
• Urinary incontinence

References

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