The anal canal is the terminal part of the large intestine. It is situated between the rectum and anus, below the level of the pelvic diaphragm. It lies in the anal triangle of perineum in between the right and left ischioanal fossa. The anal canal is divided into three parts.
Major organs involved in the digestive system include the mouth, stomach, small intestine, large intestine, liver, pancreas. located at the end of the digestive system. The function of the anus is to expel feces, and unwanted semisolid material produced during digestion. The cecum is a pouch that connects the ileum with eh ascending colon.
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The embryological origin of the mouth and anus is an important characteristic, and forms the morphological basis for separating bilaterian animals into two natural groupings: the protostomes and deuterostomes. In animals at least as complex as an earthworm,
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