A sphincter is a muscle that surrounds a body opening the urethra or the anus, for example and which should unconsciously remained tightly closed. During urination, sphincters relax and open when messages are relayed from your nerves and your brain to the pelvic floor muscles.
Sphincter muscles are found throughout the human body, including sphincters found in the male and female pelvic area. A sphincter muscle is a circular muscle that surrounds another structure in the body, such as the male and female ureters and anal canals.
The urinary system is one of the most vital in the human body. It has 2 functions:
A study on the response of the external anal sphincter EAS to the passage of urine through the urethra during micturition could not be found in the literature. We investigated the hypothesis that urine passage through the urethra effects EAS contraction to guard against possible flatus or stool leakage during micturition.
Anal sphincter definition of anal sphincter by Medical dictionary https: When relaxed, a sphincter allows materials to pass through the opening.
The external anal sphincter or sphincter ani externus is a flat plane of muscular fibers, elliptical in shape and intimately adherent to the skin surrounding the margin of the anus. In a considerable proportion of cases the fibers decussate in front of the anus, and are continuous with the superficial transverse perineal muscle.
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