Chapter 41 Digestive System

Chapter 41 Digestive System - Chapter 41 Digestive System 1...

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Chapter 41 Digestive System 1
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Digestion and absorption ¢ It is the physical and chemical break down of food ¢ Absorption l It is the passing of the digested food through the epithelial cells into the blood stream 2
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Digestive system 3
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Gastrointestinal tract ¢ It is the alimentary canal ¢ Mouth ¢ Pharynx ¢ Esophagus ¢ Stomach ¢ Small intestine ¢ Large instestine 4
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Accessory digestive organs ¢ Salivary glands ¢ Gallbladder ¢ Liver ¢ pancreas 5
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General histology of the gastrointestinal tract ¢ It has 4 tunics l Mucosa Epithelium – simple columnar Lamina propria – areolar tissue Muscularis mucosa Smooth muscle that enables movement of the mucosa 6
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General histology of the gastrointestinal tract Functions of the mucosa are secretion, absorption, protection l Submucosa Dense connective tissue Blood vessels Lymph nodes and vessels Submucosal plexus Functions are nutrition and protection of the mucosa 7
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General histology of the gastrointestinal tract l Muscularis externa Inner circular layer of smooth muscle Outer longitudinal layer of smooth muscle Myenteric plexus Allows GI movements 8
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General histology of the gastrointestinal tract l Serosa (abdominal organs) Most outer layer Mesothelium – areolar tissue Functions is to reduce friction between GI organs l Adventitia Coarse fibrous tissue that binds the GI organs to the surrounding tissues. Anchors and protects them 9
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Oral cavity 10
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Macroscopy of the digestive tract ¢ Oral cavity or mouth l Oral cavity l Lips or labia l Cheeks l Palate Soft with uvula Hard Palatine raphe 11
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Macroscopy of the digestive tract l Tongue Mylohyoid muscle Lingual frenulum Superior Inferior l Vestible l Palatine tonsil Palatoglossal arch Palatopharyngeal arch 12
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Macroscopy of the digestive tract l Lingual tonsil l Salivary glands Saliva Salivary amylase ¢ Pharynx l Nasopharynx l Oropharynx l Laryngopharynx 13
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Macroscopy of the digestive tract ¢ Esophagus l Peristalsis l Gastroesophageal sphincter l Adventitia and not serosa ¢ Stomach l Cardiac region l Fundus l Body 14
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Macroscopy of the digestive tract l Pyloric region Pyloric sphincter l Greater curvature l Greater omentum From the greater curvature down to the abdominal organs l Lesser curvature 15
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Macroscopy of the digestive tract l Lesser omentum l From the lesser curvature to the liver l Gastric pit l Gastric rugae l Function of the stomach is to process the food forming the chyme 16
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Histology of the stomach 17
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Histology of the stomach ¢ Mucosa ¢ Submucosa l Gastric glands Chief or zymogenic cells: Located on the fundus Produce pepsinogen Blue-staining cells 18
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Parietal cells: Located on the fundus
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Chapter 41 Digestive System - Chapter 41 Digestive System 1...

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