Anatomy
Lowest part of intestine, from lower end sigmoid, down and back about 2.5-4 cms to anus, no peritoneal covering, double sphincter (internal along length and external at anus), supported sling-like by levator ani (thin muscle group of pelvic floor which support its organs and act sphincter-like in maintaining continence and opposing increases in pelvic pressure during straining/expulsion by abdominal muscles).
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