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Esophagu1 - Esophagus Epithelium Esophagus Esophagus...

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Digestive System Esophagus * The inferior segment is constricted forming the lower esophageal sphincter which, along with the diaphragm, closes to prevent back flow of stomach contents * Heartburn - when HCl from the stomach regurgitates back into the lower esophagus resulting in a burning sensation. Esophagus Esophagus - SEM Esophageal Stomach Junction Esophagus General Structure * Mucosa * Linning epithelium * Lamina propria * Muscularis mucosa * Submucosa * Adventitia or serosa Esophagus: Mucosa * The inner lining consist of thick stratified squamous non-keratinizing epithelium * Thin lamina propria contains fine connective tissue * Muscularis mucosa mostly longitudinally-oriented smooth muscle bundles.
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Unformatted text preview: Esophagus: Epithelium Esophagus Esophagus: Submucosa * Mucus secreting glands may be found in the submucosa. * Due to their position, they are known as submucosal glands or as esophageal glands proper * Excretory ducts pass through the muscularis mucosa and lamina propria to open into the esophageal lumen Esophagus Esophagus: Submucosal Glands Esophagus: Submucosal Glands Esophagus: Muscularis Externa * Composes of skeletal muscle in the upper one-third * A mixture of skeletal and smooth muscle in the middle one-third * Only smooth muscle in the lower one-third...
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