1.4 Basic Histology of the Gut Tube

Question 1

Does the entire G.I. tract share common Histological features?

Answer 1

Yes

Question 2

What are the 4 distinct functional layers throughout the G.I. tract?

Answer 2

1. The Mucosa (Mucous Membrane)
2. The Sub-Mucosa
3. The Muscularis Externa (Propria)
4. The Serosa / Adventitia

Question 3

What is the Mucosa (Mucous Membrane) made up of?

Answer 3

1. Epithelium
2. Lamina Propria
3. Muscularis Mucosae

Question 4

What is the Muscularis Externa (Propria) made up of?

Answer 4

1. Inner Circular Muscle
2. Outer Longitudinal Muscle

Question 5

What is the difference in the areas covered by Serosa, than Adventitia?

Answer 5

The Areas covered by the Serosa are also covered by Peritoneum
The Areas covered by the Adventitia are areas which are not covered by the Peritoneum

Question 6

What are the 4 basic Mucosal types in the G.I. tract?

Answer 6

1. Protective
2. Secretory
3. Absorptive
4. Absorptive / Protective

Question 7

Where is the Protective Mucosa seen?

Answer 7

1. The Oral Cavity
2. The Pharynx
3. The Oesophagus
4. The Anal Canal

Question 8

Where is the Secretory Mucosa seen?

Answer 8

This is seen only in the Stomach

Question 9

Where is the Absorptive Mucosa seen

Answer 9

This is typical of the Small Intestine

Question 10

Where is the Absorptive / Protective Mucosa seen?

Answer 10

This lines the whole of the Colon