¥puborectalis muscle
The puborectalis muscle, part of the levator ani muscle group, must be voluntarily relaxed to facilitate defecation. This patient most likely has pelvic dyssynergia, which leads to increased sphincter tonus and inability to empty the anal canal. Normally, defecation is enabled by simultaneous voluntary contraction of abdominal muscles and relaxation of the external anal sphincter and puborectalis muscle.
gastrointestinal
Amboss level4
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