Introduction to the Alimentary Canal Flashcards Preview

GI > Introduction to the Alimentary Canal > Flashcards

Flashcards in Introduction to the Alimentary Canal Deck (23):
1

What are the functions of the digestive system?

Digestion
Secretion
Absorption
Motility

2

What are the 4 layers of the alimentary canal?

Mucosa
Submucosa
Muscularis Externa
Serosa/Adventitia

3

What are the 3 layers of the mucosa?

Epithelium
Lamina propria
Muscular mucosae

4

What type of cells make up the epithelium of the mouth, oesophagus and anal canal?

Stratified squamous

5

What type of cells make up the epithelium of the stomach, small and large intestine?

Simple columnar

6

What does the epithelium do?

Absorbs products of digestion

7

What type of tissue is lamina propria?

Loose, connective tissue

8

What type of muscle is the muscularis mucosae?

Smooth muscle

9

What type of tissue is the submucosa?

Thick, irregular connective tissue

10

What does the submucosa do?

Supports mucosa

11

Where do you find submucosal glands?

Oesophagus
Duodenum

12

What type of tissue is serosa/adventitia?

Connective tissue

13

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)

14

What are the 2 layers of the muscularis externa?

Circular muscle (inner)
Longitudinal muscle (outer)

15

What is the function of the muscularis externa?

Produces motility for peristalsis and segmentation

16

Where is the myenteric plexus (Auerbach's) located?

Between the circular and longitudinal layers

17

What comprises the enteric nervous system?

Myenteric plexus and Submucosal plexus

18

What is the parasympathetic innervation of the alimentary canal?

Vagus nerve

19

What is the sympathetic innervation of the alimentary canal?

Splanchnic nerve

20

What is the effect of parasympathetic innervation?

Stimulatory (increases secretion and motility)

21

What is the effect of sympathetic innervation?

Inhibitory (decrease secretion and motility)

22

What is the main arterial supply of the GI tract?

Celiac trunk
Superior mesenteric artery
Inferior mesenteric artery

23

What is the venous drainage of the GI tract?

Gastric to hepatic portal to hepatic to IVC
Splenic to hepatic portal to hepatic to IVC
Sup/Inf mesenteric to hepatic portal to hepatic to IVC