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Digestive System Cat, Histology and Models Glands and Tonsils on the Models • Submandibular gland • Sublingual gland • Parotid gland • Palatine tonsil • Pharyngeal tonsil Glands • Parotid gland • Submandibular Glands Sublingual Submandibular Pharyngeal tonsil Palatine tonsil Uvula Lingual frenulum Cardiac region Stomach Fundus region Lesser curvature Pyloric region Greater curvature Stomach Pyloric sphincter Plicae circularis Duodenum Rugae PANCREAS AND SPLEEN MODELS • • • • Kidney Gall bladder Pancreas spleen (function is to remove foreign antigens and aging RBC’s) • duodenum • plicae circularis Spleen Plicae circularis Duodenum Pancreas Pancreas Gall bladder Spleen Kidney Plicae circularis Duodenum GI MODEL • • • • • • • • • • • • • • • • Stomach Pancreas Spleen Pyloric sphincter circular folds (known as plicae circularis; these are macroscopic folds in the mucosa) ascending colon transverse colon descending colon tenia coli Jejunum (middle part of small intestine) Ileum Cecum Ileocecal valve Appendix Rectum NOTE: Plicae circularis, microvilli, and villi all increase the surface area of the small intestinal lining GI Model Pyloric sphincter Stomach Duodenum Spleen Pancreas Plicae circularis Transverse colon Tenia coli Ascending colon Descending colon Jejunum Rectum Ileocecal valve Ileum Cecum Plicae circularis Appendix Tenia coli Rectum INTESTINE MODEL • • • • • • • • • • • • • • • • Stomach Pancreas Spleen Pyloric sphincter circular folds (known as plicae circularis; these are macroscopic folds in the mucosa) ascending colon transverse colon descending colon tenia coli Jejunum (middle part of small intestine) Ileum Cecum Ileocecal valve Appendix Rectum NOTE: Plicae circularis, microvilli, and villi all increase the surface area of the small intestinal lining Duodenum Pancreas Greater Omentum Tenia coli Transverse colon Jejunum Cecum Pancreas Common bile duct Duodenum Tenia coli Descending colon Mesentery Appendix Ascending colon Sigmoid colon (first half) Cecum Other half of the Sigmoid colon Intestine Common Bile Duct Mesentery Tenia coli Jejunum Ascending colon Descending colon Mesentery Cecum Appendix Sigmoid colon Rectum Posterior View Pancreas Descending colon Mesentery Duodenum Ascending colon Cecum Appendix Sigmoid colon Rectum Liver Models • • • • gall bladder cystic duct common bile duct falciform ligament Liver CYSTIC DUCT, GALL BLADDER COMMON BILE DUCT (has been cut) Falciform ligament Liver COMMON BILE DUCT (has been cut) Falciform ligament CYSTIC DUCT, GALL BLADDER Liver Cystic duct Gall bladder Pancreas Duodenum Common Bile duct Liver Lobule Sinusoids with Kupfer cells (macrophages) Hepatic Triad: artery, vein, bile duct Central vein Intestinal Villus • Villus • Lacteal • Intestinal crypt • Mucosa with simple columnar epithelium SLIDES • Salivary gland • Tongue – taste bud • Small Intestine – Villi – Intestinal crypt Salivary gland Salivary gland Tongue Taste buds SLIDES • Small intestine layers – Mucosa – Submucosa – Muscularis externa • Inner circular layer • Outer longitudinal layer – Serosa Serosa Mucosa Muscularis Externa Submucosa Inner circular layer Outer longitudinal layer SLIDES • Small intestine – Villi, microvilli, and plicae circularis: (Serve to increase the surface area of the small intestine) – Intestinal crypts Small Intestine Villus Intestinal crypt SLIDES • Liver: the functional unit of the liver is the lobule. – central vein Liver Lobules Liver Lobule • Central vein Liver SLIDES • Spleen: removes foreign antigens and aging RBC's – Red pulp – White pulp • Pancreas – Islets – Acini – Be able to tell the difference between liver, spleen, pancreas, and kidney slides! Spleen Spleen Red Pulp White pulp Pancreas Islet of Langerhans (secretes insulin) Pancreas Acinar cells (secrete digestive enzymes) Islet of Langerhans (secretes insulin) Pancreas: don’t get this confused with a glomerulus in the kidney! Pancreas Kidney Spleen Red Pulp White pulp Liver Central vein
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