Anatomy

Question 1

Histology of Small Intestine

Answer 1

1. Mucosa
2. Submucosa
3. Circular muscle
4. Longitudinal muscle
5. Subserosa
6. Serosa

1. Enterocytes/goblet cells + villi + crypts of Lieberkuhn (Paneth & endocrine cells) + lamina propria (Peyers patch - GALT)

Question 2

What is the role of :
1. Paneth Cells
2. Endocrine Cells
3. Goblet Cells
4. Brunner’s Gland

Answer 2

1. Contain esoinophilic lysozyme rich granules, defensins, immunoglobulins.
2. Gut hormones
3. Mucin production
4. Found in duodenal submucosa. Produce alkaline mucous to neutralize acid.

Question 3

Histology of Large Intestine

Answer 3

1. Mucosa
2. Submucosa
3. Muscularis propria
4. Sub serosa
5. Serosa

function: water absorption + storage/elimination of food residues

4. Circular layer becomes internal anal sphincter. Longitudinal bands called taenia coli.