GI Anatomy

Question 0

Name the two surfaces that comprise the gastrointestinal wall?

Answer 0

1. Serosal

2. Mucosal

Question 1

List the structures of the GI tract starting with the mouth and ending with the anus. Be sure to break down the different sections of the small intestine.

Answer 1

1.Mouth 2. Esophagus 3. Stomach 4. Small intestine (duodenum, jejunum, ileum) 5. Colon/large intestine 6. Anus

Question 2

What does the serosal surface face?

Answer 2

The blood

Question 3

What does the mucosal surface face?

Answer 3

Lumen

Question 4

What are the 3 sublayers of the mucosal layer?

Answer 4

1. Epithelial cell layer
2. Lamina propria
3. Musularis mucosae

Question 5

Starting with the mucosal layer, list all of the layers of the gastrointestinal tract.

Answer 5

1. Mucosal layer (epithelial cells, lamina propria and muscularis mucosae) 2. Submucosal layer 3. Muscle (circular and longitudinal) 4. Serosa

Question 6

Which smooth muscle layer is most densely innervated?

Answer 6

The circular layer (this layer is also the thickest)

Question 7

Where in the gastrointestinal tract is the submucosal plexus (Meissner’s plexus) located?

Answer 7

Between the submucosa and the circular smooth muscle

Question 8

Where in the gastrointestinal tract is the myenteric plexus located?

Answer 8

In between the circular and longitudinal muscle