anal canal. An anal valve forms the inferior boundary of an anal sinus. The anal valves demarcate the level of the pectinate line. Sinnatamby, Chummy...

mucosa which are joined inferiorly by folds of mucous membrane known as anal valves supplied by the superior rectal artery (a branch of the inferior mesenteric...

external anal sphincters, two muscular rings which control defecation.: 397  The anus is surrounded in its length by folds called anal valves, which converge...

ileocecal valve (ileal papilla, ileocaecal valve, Tulp's valve, Tulpius valve, Bauhin's valve, ileocecal eminence, valve of Varolius or colic valve) is a...

is followed by the anal canal, which is about 4 centimetres (1.6 in) long, before the gastrointestinal tract terminates at the anal verge. The word rectum...

anal sphincter is far more substantial than the internal anal sphincter. The proximal portion of external anal sphincter overlaps the internal anal sphincter...

line) is a line which divides the upper two-thirds and lower third of the anal canal. Developmentally, this line represents the hindgut-proctodeum junction...

human anal glands are situated within the wall of the anal canal and communicate with the lumen of the canal via ducts that open at the anal valves, just...

The internal anal sphincter, IAS, or sphincter ani internus is a ring of smooth muscle that surrounds about 2.5–4.0 cm of the anal canal. It is about...

inferiorly by an anal valve (which unites the inferior ends of a pair of adjacent anal columns). The anal glands open into the anal sinuses. Sinnatamby...