Microanatomy

Question 1

What are the 4 layers of the GI tract walls?

Answer 1

Mucosa, submucosa, muscularis externa, serosa

Question 2

What are the three components of the mucosa?

Answer 2

The epithelium, lamina propria and muscularis mucosa

Question 3

What is in the submucosa?

Answer 3

dense connective tissue containing submucosal plexus

Question 4

Which layer controls peristalsis?

Answer 4

Muscularis externa

Question 5

Which layer forms part of the peritoneum?

Answer 5

The serous layer

Question 6

What type of muscle is the top third of the oesophagus?

Answer 6

Skeletal muscle

Question 7

What type of muscle is the bottom third of the oesophagus?

Answer 7

smooth muscle

Question 8

Where are mucus secreting glands in the oesophagus?

Answer 8

The lamina propria (mucosa) and the submucosa

Question 9

What epithelial cells line the oesophagus?

Answer 9

Squamous

Question 10

What are the recessions between micro villi called?

Answer 10

Crypts

Question 11

What type of epithelium is in the small intetsine?

Answer 11

Simple columnar

Question 12

What 4 specialised cells are within the epithelium of the villi?

Answer 12

Absorptive cells, goblet cells, granular cells and APUD cells

Question 13

How often is the epithelium renewed?

Answer 13

every 3-6 days

Question 14

Is the epithelium of the large intestines villous?

Answer 14

No

Question 15

Describe the large intetsing epithelium

Answer 15

Simple columnar, with crypts but no villi.

Question 16

What cells are more numerous in the large intestine than the small?

Answer 16

Goblet cells. more mucous.

Question 17

What is the longtitudinal bands of muscle called in the large intesting?

Answer 17

Taeniae coli