Chapter23DigestivePart2Marieb

Chapter23DigestivePart2Marieb - Ch 23: Digestive System,...

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Objectives: Discuss the general functions and anatomy of the digestive tract, including accessory structures. First, an overview of the tubular nature of the digestive system. Describe the individual organs of the system, including a discussion of the gross and microscopic anatomy. Developed by John Gallagher, MS, DVM Ch 23: Digestive System, Part 2
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General Organization of a Tubular Organ (Repetio est….)
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1) Mucosa Epithelium - usually simple columnar with goblet cells; may be stratified squamous if protection needed Lamina propria areolar connective tissue deep to epithelium Muscularis mucosae - produces folds - plicae (small intestine) or rugae (stomach) 2) Submucosa made up of loose connective tissue contains submucosal plexus and blood vessels 3) Muscularis externa smooth muscle, usually two layers (controlled by the myenteric plexus; source of peristalsis ) - inner layer: circular outer layer: longitudinal 4) Serosa visceral layer of mesentery (contiguous with the peritoneum) or adventitia depending on location Fig 23.7 The 4 Layers of the Gut (review)
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SI is longest part of alimentary canal. Almost all absorption of nutrients is in SI, with a few important exceptions. 1.
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This note was uploaded on 12/16/2011 for the course BIOLOGY 101 taught by Professor Mr.wallace during the Fall '11 term at Montgomery College.

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Chapter23DigestivePart2Marieb - Ch 23: Digestive System,...

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