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classification constipation crohns diagnosis examination external fistulas floor gastroenterology geriatrics ibd internal muscle parks pathophysiology pelvic perianal rectal sphincter
Figure 1. The normal #pelvic #floor at rest during #rectal #examination. The #internal anal #sphincter #muscle
muscles and the #puborectalis
Parks Classification of Perianal Fistulas • Superificial (Simple) - Superficial fistula w/o crossing any sphincter or
the top of the puborectalis
Pathogenesis of Select Causes of Constipation in Adults and in Elderly • Mechanical (ex. Bowel Obstruction,
Dyssynergia -> Puborectalis
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