GI

Question 1

4 basic layers throughout GI tract - in to out

Answer 1

1. mucosa - lining epithelium
2. submucosa - loose CT
3. muscularis externa - smooth muscle for peristalis
4. serosa/adventitia - outer layer of CT

Question 2

features of esoph. adventitia/serosa

Answer 2

adventitia in thorax, serosa in abdo

- espohageal plexus

Question 3

muscle type of esoph muscularis

Answer 3

moves from striated in upper third to all smooth muscle in lower third

Question 4

contents of esoph. submucosa (2)

Answer 4

1. submucosal glands

2. vascular plexus

Question 5

cell types of esoph muscosa

Answer 5

non-keratinazed stratified squamous

Question 6

4 parts of stomach

Answer 6

1. cardia
2. body
3. fundus
4. pyloric antrum

Question 7

feat of stomach muscularis (2)

Answer 7

2 layers

1. inner circular layer
2. oblique layer in body

Question 8

feat. of submucosa of stom.

Answer 8

forms rugae

Question 9

cell types of mucosa of stom.

Answer 9

simple columnar epi on lamina propria

Question 10

6 cell types of stom. mucosa and their productions

Answer 10

1. surface cells - none
2. neck cells
3. patietal cells - HCl and intrinsic factor
4. chief cells - digestive enzymes
5. enteroendocrine cells - hormones
6. stem cells - more cells

Question 11

feat. of small intestine submucosa (3)

Answer 11

1. plicae circularis - folds of mucosa and submucosa
2. mucous glands in duodenum
3. peyers patches (lymph) in illeum

Question 12

cell types of epi of small int. mucosa

Answer 12

simple columnar with brush border of microvillae

Question 13

7 cell types of mucosa of small int. and function

Answer 13

1. enterocytes - absorb digestive products
2. goblet cells - mucous
3. paneth cells - secrete lysozyme and a-defensin
4. enteroendocrine - hormones
5. lymphocytes
6. M cells - sample contents to give to lymphocytes
7. stem cells

Question 14

3 features of small int. lamina propria

Answer 14

1. peyers patches
2. capillary plexus
3. lacteals - lymph caps. that pick up fat

Question 15

feature of large int. serosa

Answer 15

appendices epiploicae - fat tags

Question 16

2 layers of large int. muscularis

Answer 16

1. outer long. layer- 3 ribbons (taemia coli)

2. inner circular layer

Question 17

features of large int. muscosa

Answer 17

1. long. fold in anal canal
2. crypts but no villae
3. golblet cells in a simple columnar epithelium