Flashcards in Introduction to the Alimentary Canal Deck (23):
What are the functions of the digestive system?
What are the 4 layers of the alimentary canal?
What are the 3 layers of the mucosa?
What type of cells make up the epithelium of the mouth, oesophagus and anal canal?
What type of cells make up the epithelium of the stomach, small and large intestine?
What does the epithelium do?
Absorbs products of digestion
What type of tissue is lamina propria?
Loose, connective tissue
What type of muscle is the muscularis mucosae?
What type of tissue is the submucosa?
Thick, irregular connective tissue
What does the submucosa do?
Where do you find submucosal glands?
What type of tissue is serosa/adventitia?
What is the difference between serosa and adventitia?
Serosa is inside the peritoneal cavity (stomach, small and large intestine)
Adventitia is outside the peritoneal cavity (oesophagus and rectum)
What are the 2 layers of the muscularis externa?
Circular muscle (inner)
Longitudinal muscle (outer)
What is the function of the muscularis externa?
Produces motility for peristalsis and segmentation
Where is the myenteric plexus (Auerbach's) located?
Between the circular and longitudinal layers
What comprises the enteric nervous system?
Myenteric plexus and Submucosal plexus
What is the parasympathetic innervation of the alimentary canal?
What is the sympathetic innervation of the alimentary canal?
What is the effect of parasympathetic innervation?
Stimulatory (increases secretion and motility)
What is the effect of sympathetic innervation?
Inhibitory (decrease secretion and motility)
What is the main arterial supply of the GI tract?
Superior mesenteric artery
Inferior mesenteric artery