The GI Tract

Question 0

What is the second layer of the tract?

Answer 0

Submucosa which is a thick connective tissue layer containing blood vessels, lymph vessels and nerves

Question 1

What is the inner most layer of the tract called and what is it made of?

Answer 1

The mucosa which is stratified squamous in mouth, anal cavity, oropharynx and oesophagus and and simple columnar epithelium everywhere else

Question 2

What is the third layer of the tract and what are its two layers?

Answer 2

The muscularis which has an inner layer of smooth muscle and an outer layer of longitudinal muscle

Question 3

What is the final layer of the tract?

Answer 3

The serosa or the serous membrane which consists of a thin connective tissue covering and a simple squamous epithelium layer which secretes fluid

Question 4

What is the difference between serosa and Adventia?

Answer 4

some regions have adventia not serosa with the difference being that the function changes and it acts as a binding substance which blends to the connective tissue in the oral cavity, pharynx, oesophagus and rectum