Topic 15: Digestive System - GI Tract Histology Flashcards
1
Q
What are the four basic layers of the GI tract?
A
- Mucosa
- Submucosa
- Muscularis Externa
- Serosa (or adventitia)
2
Q
What are the 3 layers of mucosa?
A
- epithelium with numerous goblet cells
- lamina propria
- muscular mucosa
3
Q
Where can you find the stratified squamous epithelium layer of mucosa? (4)
A
- mouth
- pharynx
- esophagus
- anal canal
4
Q
Where can you find the simple columnar epithelium layer of mucosa? (3)
A
- stomach
- small and large intestine
- rectum
5
Q
What tissue is the lamina propria of mucosa made of?
A
areolar CT
6
Q
What does the lamina propria of the mucosa contain? (3)
A
- blood
- lymph vessels
- lymph nodules/tissues (immune)
7
Q
What is the muscular mucosa made of? (2)
A
- smooth muscle
- allows movement of mucosa
8
Q
What type of tissue is submucosa?
A
areolar CT
9
Q
What does the submucosa contain?
A
- blood
- lymphatic vessels
- submucosal nerve plexus
10
Q
What type of muscle is the muscularis externa made of?
A
- smooth muscle
11
Q
What is the inner and outer layer of the muscularis externa?
A
- inner circular layer
- outer longitidinal layer
12
Q
What is between the two layers of the muscularis externa?
A
myenteric nerve plexus
13
Q
What does contraction of the muscularis externa cause?
A
- motility ( mixing + movement)
14
Q
What does the serosa (adventitia) contain?
A
- cavity (lumen)
