GI Layers And Cells

Question 1

What are the 4 GI layers from inside to outside?

Answer 1

Mucosa
Submucosa
Muscularis externa
Serosa

Question 2

What is found in the submucoa?

Answer 2

The submucosal plexus

Subdivision of enteric NS

Question 3

What does the enteric NS communicate with in the GI tract?

Answer 3

Communicates with 2 plexuses

Question 4

What 2 things does the muscularis externa contain?

Answer 4

Muscle layers

Myenteric plexus

Question 5

What mucle layers and how many thles are found in GI and stomach?

Answer 5

2 in GI - inner circular, outer longitudinal

3 in stomach - inner oblique, intermediate circular, outer longitudinal

Question 6

What does the muscularis externa contain?

Answer 6

Myenteric plexus

Enteric NS, interacts with them

Question 7

What cells are found at the lower oseophageal sphincter at cardiac notch? What does it produce?

Answer 7

Foveolar

Produce mucus

Question 8

What cells are found at the fundus what what do they produce?

Answer 8

Parietal cells - HCl, intrinsic factor for B12 deficiency
Chief cells - pepsinogen
Enterochromafin like cells - histamine

Question 9

What cells are found at the body, pylorus and antrum amd what they produce?

Answer 9

G cells - gastrin
D cells - somatostatin - duodenum & pamcreatic cells pf langerhans
(I cells - CCK, bile secretion) - duodenum
S cells - secretin - duodenum