anorectal flexure

(redirected from anorectal angle)

a·no·rec·tal flex·ure

[TA]
the anteroposterior curve or angle, with convesity directed anteriorly, of the anorectal junction; tonus of the puborectalis (muscle) produces the angle for maintaining fecal continence; relaxation of the muscle allows the angle to be reduced for defecation.

anorectal flexure

The sharp forward bend at the anorectal junction as the rectum passes through the pelvic diaphragm muscles. This acute bend, which is normally maintained by the puborectalis sling muscles, helps to keep feces in the rectum. During defecation the pelvic diaphragm muscles relax (so the puborectalis sling relaxes) and the sharp bend between rectum and anus straightens; this makes the passage of feces from rectum to anus easier.
See also: flexure
References in periodicals archive ?
4) The muscles of the pelvic floor normally maintain the anorectal angle.
Through both still images and a dynamic series of images as the patient defecates, defecography shows the anorectal angle, which is a function of the levator ani.