Histology

Question 1

How many microvilli does an enterocyte have?

Answer 1

300

Question 2

Duodenum vs jejunum vs ilium

Answer 2

DUODENUM
Few goblet cells, short broad villi, long straight crypts, Brunner’s glands
JEJUNUM
Many goblet cells, short crypts, long and narrow villi, no Brunner’s gland, no Peyer’s patches, lymph nodules only in lamina proparia
ILIUM
Peyer’s patches which erupt through muscular is mucosa, goblet cells increase in number at distal end

Question 3

Describe the vermiform appendix (villi, lining, lymphoid, goblet cells, muscularis mucosa)

Answer 3

No villi
Simple columnar with goblet cells
Lamina proparia and sub mucosa with lymphoid tissue
No muscularis mucosa
Taenia coil originate from base

Question 4

Describe histology of the colon

Answer 4

No villi
Close packed intestinal crypts (enterocytes + many goblet cells)
Prominent muscularis mucosa
GALT (lymph nodules in mucosa and sub)
Longitudinal muscle layer drawn into 3 longitudinal bands (taeniae coli)

Question 5

Histology of the muscularis mucosa

Answer 5

2 layers of smooth muscle and elastic tissue

Question 6

Does the stomach have lymphoid tissue in the lamina proparia?

Answer 6

NO!

Question 7

Lining of the biliary tree

Answer 7

Cuboidal epithelium, stratified at distal end

Question 8

Describe histological structure of the gall bladder

Answer 8

Simple columnar epithelium with few microvilli that is thrown into folds
Submucosa of connective tissue with large veins in wall
Smooth muscle
Serosa