23. Digestive System

Stimuli and controls of digestive activity

Overview: General Features

The enteric nervous system

Digestive: Anatomy Review

The visceral peritoneum covers the external surfaces of most digestive organs. The parietal peritoneum lines the body wall. A mesentery is a double layer of peritoneum that extends to the digestive organs from the body wall. The term omenta refers to mesenteries that are associated with the intestines.

 The serous membrane that covers the external surfaces of most digestive organs is called the __________. 

 Gastrin is the major stomach hormone. Both the stomach and the small intestine produce this chemical. 

 Which regulatory chemical stimulates gastric gland activity and motility? 

Overview of the Digestive System

The Digestive System

Control of the GI tract | Gastrointestinal system

Peritoneum - 3D Schematic Anatomy & Relations

Peritoneal Cavity

SAD PUCKER Retroperitoneal Organs Mnemonic

 the sympathetic division of the autonomic nervous system 

Inhibitory sympathetic inputs are part of the long reflexes in the digestive system.

 the parasympathetic division of the autonomic nervous system 

The parasympathetic division stimulates the long reflexes in the digestive system.

Higher brain centers stimulate the long reflexes in the digestive system.

 The short reflexes in the digestive system are stimulated by __________. 

The 4 Layers of the Alimentary Canal

Digestive System - Peritoneal cavity

 It is composed of a layer of serous membrane fused with a layer of mucous membrane. 

 It provides a route for blood vessels, lymphatics, and nerves to reach the digestive viscera. 

 It holds the organs of the abdomen in place. 

Omenta is the special name for part of the mesentery extending from the curvatures of the stomach.

 Which of the following statements about the mesentery is INCORRECT? 

 The enteric nervous system is the in-house nerve supply of the alimentary canal. Enteric plexuses interconnect like chicken wire all along the GI tract and regulate digestive activity throughout its length. 

 The enteric nervous system is the in-house nerve supply of the alimentary canal. 

What Is The Digestive System - How The Digestive System Works - Digestive System Function

Control of the Digestive System

Digestive System

Peritoneal Cavity - Intraperitoneal and Retroperitoneal Organs 

A Closer Look at the Digestive Tract

Anatomy Review Digestive 

 mucosa, muscularis externa, submucosa, serosa 

 The mucosa is the layer that lines the lumen; it is followed by the submucosa, muscularis externa, and serosa. 

 serosa, mucosa, muscularis externa, submucosa 

 submucosa, mucosa, muscularis externa, serosa 

 mucosa, submucosa, muscularis externa, serosa    

 muscularis externa, serosa, submucosa, mucosa 

 Which sequence below represents the correct order of the tunics of the GI tract, starting from the layer adjacent to the lumen and moving superficially? 

 The myenteric nerve plexus lies between the circular and longitudinal muscle layers of the GI tract wall and controls motility.  

 The myenteric nerve plexus is located in which tunic of the alimentary canal? 

Layers of the GI Tract

How your digestive system works

 Although a perforating ulcer of the stomach would cause peritonitis, it is not the most common cause. 

 Although a perforating abdominal wound would cause peritonitis, it is not the most common cause. 

 Although a ruptured pancreatic cyst would cause peritonitis, it is not the most common cause. 

 Which of the following is the most common cause of peritonitis? 

 The digestive system is divided into the alimentary canal (GI tract or gut) and accessory digestive organs. The alimentary canal consists of the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The accessory organs for digestion include the teeth, tongue, gallbladder, liver, pancreas, and salivary glands. 

 Which of the following is NOT an accessory organ of the digestive system? 

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