Peritonitis is life threatening and often results in emergency surgery to correct the underlying problem and intensive antibiotic therapy. By the end of this section, you will be able to: The function of the digestive system is to break down the foods you eat, release their nutrients, and absorb those nutrients into the body. Large intestine. It is made of: epithelium; lamina propria These enteric neurons are grouped into two plexuses. Epithelial cells have a very brief lifespan, averaging from only a couple of days (in the mouth) to about a week (in the gut). David N. Shier, Jackie L. Butler, Ricki Lewis, Hole's Essentials of Human Anatomy and Physiology, David Shier, Jackie Butler, John Hole, Ricki Lewis. Together, these are called accessory organs because they sprout from the lining cells of the developing gut (mucosa) and augment its function; indeed, you could not live without their vital contributions, and many significant diseases result from their malfunction. Contains the submucosal enteric neural plexus that controls GI secretions and localized blood flow, David N. Shier, Jackie L. Butler, Ricki Lewis, Charles Welsh, Cynthia Prentice-Craver, David Shier, Jackie Butler, Ricki Lewis, Hole's Essentials of Human Anatomy and Physiology, David Shier, Jackie Butler, John Hole, Ricki Lewis. General structure of the gut wall: This cross section shows the mucosa in relation to the interior space, or lumen. Layers of the Alimentary Canal | Boundless Anatomy and Physiology Gastrointestinal wall - Wikipedia From the inside out they are called the mucosa, submucosa, muscularis externa, and serosa. Describe the orientation of smooth muscle fibers in the muscularis externa of the digestive tract. In general, the GI tract is composed of. Even after development is complete, they maintain a connection to the gut by way of ducts. These intestinal veins, constituting the hepatic portal system, are unique in that they do not return blood directly to the heart. The mesentery is an extension of the visceral peritoneum that attaches the small intestine to the rear abdominal wall. Accessory digestive organs comprise the second group and are critical for orchestrating the breakdown of food and the assimilation of its nutrients into the body. describe the four layers of the gi tract - Kazuyasu
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