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Lecture 41

Anatomy and Cell Biology 3319 Lecture 41: Lower Digestive Tract 2 - Large Intestine
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Department
Anatomy and Cell Biology
Course Code
Anatomy and Cell Biology 3319
Professor
Peter Merrifield

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Mucosa with folds Cystic duct Duodenum Hepatopancreatic ampulla and sphincter Major duodenal papilla Right and ieft hepatic ducts of liver Common hepatic duct Bile duct and sphincter Accessory pancreatic duct Jejunum Main pancreatic duct and sphincter Mucosa with folds Cystic duct Duodenum Hepatopancreatic ampulla and sphincter Major duodenal papilla Right and ieft hepatic ducts of liver Common hepatic duct Bile duct and sphincter Accessory pancreatic duct Jejunum Main pancreatic duct and sphincter41. Small Intestine, Large Intestine, and Accessory Organs Objectives • Describe the duodenum and its associated structures (i.e. pancreas and gall bladder). • Describe the visceral surface of the liver. What structures entering the porta hepatis contribute to the “triads” of the liver ? • Describe the distinguishing features of the jejunum and ileum. • Define the following terms: epiploic appendages, plicae semilunares, taenia coli and haustra. • Describe the anal canal and the processes involved with defecation Small Intestine • Duodenum is the first part of the small intestine o Begins at the pyloric sphincter from the stomach o Secretions from gall bladder & pancreas enter here for digestion o Retroperitoneal within peritoneal cavity via secondary development o C-shaped  superior, descending, and transverse part ▪ Head of pancreas is nestled into here o Descending duodenum contains major duodenal papillae which receives secretions from gall bladder & pancreas o About 25cm in length o Contain plicae circulares for increased surface area • Pancreas – Accessory organ o Secondarily retroperitoneal o Exocrine & endocrine organ – Many exocrine acinar glands + few clusters of endocrine cells (islets of Langerhans) ▪ Acinar cells secrete at least 22 kinds of pancreatic enzymes for digesting food o Enzymes are secreted as
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