Layers of the Gut Wall Flashcards
1
Q
What are the four major layers of the gut wall?
A
- mucosa
- submucosa
- muscularis externa
- serosa or adventitia
2
Q
Describe the mucosa.
A
the mucous membrane, which forms the innermost layer and contains the muscularis mucosae, a thin layer of smooth muscle
3
Q
Describe the submucosa.
A
a loose connective tissue layer containing blood vessels and lymphatics
4
Q
Describe the muscularis externa.
A
- a thick layer of smooth muscle responsible for peristalsis
- it consists of:
1. inner circular layer
2. outer longitudinal layer
5
Q
What is peristalsis?
A
- propulsive movement of the gut
- contractile ring appears and moves distally
6
Q
What is reverse peristalsis?
A
occurs in vomiting
7
Q
Describe the serosa or adventitia.
A
- visceral peritoneum is referred to as serosa
- retroperitoneal organs are covered with a connective tissue coat called adventitia
