![]() Notes and Importance: The anal canal is surrounded by the internal anal sphincter (smooth muscle) and the external anal sphincter (skeletal muscle).It is typically located at approximately the fourth caudal vertebra. This region is short, approximately 1.0cm in length. What is this? The portion of the alimentary canal located between the rectum and the anus. ![]() It starts on the right side and courses cranially, it then passes to the left side cranial to the root of the mesentary (around the cranial mesenteric artery), and then courses caudally along the left side of the abdomen to the pelvic cavity, where it is continued by the rectum.
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