"The anal canal measures ~4 cm long and is continuous with the rectum at the anorectal junction, which is the angle (the anorectal angle) the rectum makes at the levator ani."
"The anal canal contains longitudinal folds of mucosa, termed the anal columns which join inferiorly to form semicircular anal valves. The anal valves collectively form the dentate (pectinate) line, which marks the embryological anal membrane and divides the anal canal into an upper and lower parts, differing in structure and neurovascular supply."
"The anal canal contains longitudinal folds of mucosa, termed the anal columns which join inferiorly to form semicircular anal valves. The anal valves collectively form the dentate (pectinate) line, which marks the embryological anal membrane and divides the anal canal into an upper and lower parts, differing in structure and neurovascular supply."
"The anal canal contains longitudinal folds of mucosa, termed the anal columns which join inferiorly to form semicircular anal valves. The anal valves collectively form the dentate (pectinate) line, which marks the embryological anal membrane and divides the anal canal into an upper and lower parts, differing in structure and neurovascular supply."
Expected headings
"Related conditions"
"above dentate line: superior rectal artery (from inferior mesenteric artery); small contributions from middle rectal artery (directly from internal iliac artery) and median sacral arteries"