Models of the Digestive System

Purpose:  The purpose of this lab investigation is to review lab models of the stomach, accessory digestive structures (pancreas, liver, gallbladder), and a sectioned view of the small intestine.

Materials and methods:  Models of the stomach, accessory organs of the digestive system, and a cross section view of the small intestine are needed for his lab.

Experiment:  Using the diagrams below, locate key structures listed on the actual models:

Stomach:  On the stomach model, locate the cardia, fundus, body, pylorus, lower esophageal sphincter, pyloric sphincter, rugae, and the three smooth muscle layers.



Accessory structures of the digestive system:  On the model of the accessory structures, locate the liver, gall bladder, pancreas, common hepatic duct, cystic duct, common bile duct, and the pancreatic ducts.  Note how the common bile duct and the pancreatic duct of Wirsung enter the duodenum.







Small intestine:  On the model of the small intestine (cross section), locate the villi, and intestinal glands.  Identify the four layers of the intestine - mucosa, submucosa, muscularis, and serosa

What are the four chambers of the stomach?

What is the pyloric sphincter?

What are rugae?

How does bile reach the duodenum?

How does pancreatic juice reach the duodenum?

What are villi?  What type vessels are located within the villi?

What are the four layers of a digestive organ?
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