The anorectal junction is where the rectum turns sharply backwards to become the anal canal. The puborectalis muscle loops behind it like a sling, creating the anorectal angle of about 90 degrees at rest.
| Location | Pelvic floor level, just in front of the tip of the coccyx |
|---|---|
| Parts |
|
| Nerve Supply | Pelvic splanchnic nerves; Pudendal nerve (puborectalis and sphincters) |
| Blood Supply | Middle and inferior rectal arteries |
| Venous drainage |
|
| Lymphatic drainage |
|
The angle created by puborectalis is a key part of keeping faeces in; it straightens to allow defecation.
Failure of puborectalis to relax (dyssynergic defecation) causes straining and incomplete emptying and is treated with biofeedback. Squatting or raising the feet straightens the angle and makes defecation easier. Childbirth injury can weaken this mechanism.
Paradoxical tightening of puborectalis during straining, causing constipation.
Loss of bowel control, often linked to weakened pelvic floor or sphincter injury.
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