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Flashcards in GI II Deck (77)
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1

What is the 4 basic layers to the wall of GI tube?

1) mucosa
2) submucosa
3) muscularis externa
4) serous/adventitia

2

What three components constitutes mucosa?

1) epithelium resting on basal lamina
2) lamina propria
3) muscularis mucosae

3

Most of the GI tract will have this type of epithelium

simple columnar

4

Which 3 portions of the GI tract will have a different type of epithelium? What type of epithelium is it?

1) proximal GI tube (esophagus)
2) distal end of GI tube
3) distal anal canal
stratified squamou

5

What's in lamina propria (4)?

1) connective tissue
2) glands
3) blood vessels
4) lymphatic tissue

6

What are the two layers of smooth muscles in muscualris mucosae?

1) inner circular
2) outer longitudinal

7

What is the purpose of the two layer of smooth muscles in muscularis mucosae?

when contracting, they wrinkle the mucosa, increasing surface area, which facilitates absorption of nutrients and secretion

8

True or false. Glands can be found in the submucosa.

True. glands can be found in this layer in the esophagus and duodenum (all others are in lamina propria)

9

What type of connective tissue is present in the submucosal layer?

dense irregular

10

Besides connective tissue, what else can be found in the submucosa?

1) glands (in esophagus and duodenum)
2) blood and lymphatic vessels
3) submucosal or Meissner's plexus

11

How many layers of smooth muscles are in muscularis externa?

two: inner circular and outer longitudinal

12

What's the function of muscularis externa?

contraction result in peristasis

13

Myenteric (Auerbach's) plexus is located in which layer?

muscularis externa

14

What's the difference between adventitia and serosa?

serosa has an extra layer (mesothelium) located external to muscularis externa. adventitia has connective tissue layer only

15

What kind of nerve fibers are found in submucosal (Meissner's) plexus?

1) parasympathetic postganglionic neurons
2) sympathetic postganglionic fibers

16

What's the function of Meissner's plexus (3)?

regulate glandular activity, blood flow, muscualris mucosae and is sensory

17

What kind of nerve fibers are found in myenteric (Auerbach's) plexus?

1) parasympathetic postganglionic neurons
2) sympathetic postganglionic fibers

18

What's the function of Auerbach's plexus?

regulate peristalsis

19

What does achalasia affect?

esophagus

20

What is Hirschsprung's disease?

congenital megacolon

21

What type of epithelium is present in esophagus?

stratified squamous, nonkeratinized

22

What distinctive feature is found in the lamina propria of the esophagus?

cardiac esophageal glands

23

Mucularis mucosae of the esophagus is better developed in which section?

distal portion of esophagus

24

What type of glands are found in submucosa of esophagus?

esophageal glands proper (seromucous)

25

The upper 5% of the esophagus is comprised of which type of muscle?

skeletal

26

Upper esophagus is comprised of which type of muscle?

skeletal and smooth

27

The lower 50% or greater of esophagus is comprised of which type of muscle?

smooth

28

Which part of the esophagus has adventitia?

thoracic esophagus

29

Which part of the esophagus has serosa?

abdominal esophagus

30

To confirm the diagnosis of Barrett's esophagus, what must be seen in a micrograph?

metaplastic columnar epithelium with goblet cells