Digestive System

Development of the

Digestive System

What are the chief derivatives of the primitive gut?

Name the embryonic germ layer that lines these structures.

Overview of Digestive Anatomy

Describe the basic functions performed by the organs of the digestive system.

Relate these functions to the tissue construction of each organ.

The Peritoneum and its folds

Double folds of the ______ form the mesentery.

What happens to the diaphragm when abdominal muscles compress digestive organs? When would this happen?

4-layer Basic Plan in the Wall of the Alimentary Canal

How does the mucosa differ between the esophagus and the small intestine? Explain why.

What is another name for serosa in the abdominal cavity?

PeristalsisDescribe the arrangement of smooth muscle in the muscularis layer.

Name a second type of movement characteristic of the alimentary canal.

Name the two divisions of the nervous system important in extrinsic regulation of digestive activities.

What role does the Enteric NS have in digestive function?

Controlling Digestive Functions

What portion(s) of this figure represent the Enteric Nervous System (ENS)?

Describe at least 2 examples of how “external influences” might affect digestive function

Anatomy of the Small Intestine

Which 3 features increase absorptive surface area in the intestine?

Regions of the Small IntestineWhich layer in the wall of the intestine is used to distinguish between these regions?

Gross Anatomy of the Pancreas

Microscopic Anatomy of the Pancreas

Name the hormones released from islet cells.

What is the meaning of “acinus”?

Liver, Gall Bladder and Associated Ducts

Name the organ that manufactures bile.

Name the only component of bile that has a digestive function.

What is the fate of cholesterol, secreted in bile?

Scheme for the Hepatic Portal System

Blood enters hepatic sinusoids from 2 sources. Name these and explain the reason for this circulatory pattern.

Name the artery from which the hepatic artery branches.

The Hepatic Lobule: Functional Unit of the Liver

What 3 tubular organs make up each “triad”.

What is the direction of blood flow within a lobule? … bile flow?

Functions of the Liver