Digestive System

Digestive System - The Digestive System Assigned reading:...

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The Digestive System Assigned reading: Chapter 22, pp.773-821
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The Digestive System
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Functional Concepts How does the GI tract decide to change its activity? Stimulus: Mechanical Chemical Response: Extrinsic (long reflexes) Intrinsic (short reflexes)
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Histology of the GI Tract Mucosa Submucosa Muscularis externa Serosa (parietal peritoneum) Lumen
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Histology of the GI Tract Intrinsic nerve plexuses: • Myenteric nerve plexus • Submucosal nerve plexus Mucosa: • Epithelium • Lamina propria • Muscularis mucosae Submucosa Muscularis externa: • Longitudinal muscle • Circular muscle Serosa: • Epithelium • Connective tissue Lumen Mucosa-associated lymphoid tissue Nerve Artery Vein Mesentery
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Functional Anatomy of the Digestive System Mouth/Salivary Glands: Esophagus Stomach Small intestines (Duodenum, jejunum, ileum) Liver, gall bladder, pancreas Large intestines
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Salivary Glands: Chemical Digestion
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Saliva: Composition Water Electrolytes (slightly acidic) Salivary amylase Lingual lipase (intrinsic glands) Control of Salivation Parasympathetic stimulates Sympathetic inhibits Salivary centers in the brain stem respond to chemo- and mechano- receptors
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The Pharynx and Esophagus
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The Peritoneal Cavity The Digestive organs inferior to the diaphragm reside inside of the peritoneal cavity Organs are covered with a serous membrane, the visceral peritoneum Organs are suspended from the posterior body wall by a mesentery
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The Stomach
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Digestive System - The Digestive System Assigned reading:...

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