Histology: GI Tract Flashcards Preview

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Flashcards in Histology: GI Tract Deck (30):
1

What are the 4 histologic layers of the GI tract?

Mucosa; submucosa; muscularis externa, and adventitia/serosa

2

What are the components of the submucosal layer?

- Connective Tissue
- Vessels
- Meissner Plexus

3

What is the location of the Meissner Plexus?

Submucosa

4

What is the location of the Auerbach Plexus?

In between the inner and outer muscle layers in the muscularis externa

5

What epithelium covers the esophagus?

Nonkeratinized stratified squamous epithelium

6

What epithelium covers the stomach?

Columnar epithelium

7

What epithelium covers the small intestine?

Villi and microvilli

8

What epithelium covers the appendix?

Columnar epithelium

9

What epithelium covers the large intestine?

Columnar epithelium with no paneth cells but a lot of goblet cells

10

What epithelium covers the anal canal?

Stratified Squamous Epithelium

11

What are the 4 parts of the stomach?

- Cardia
- Fundus
- Body
- Pylorus

12

What do parietal cells secrete?

HCl and Intrinsic Factor

13

What do chief cells secrete?

Pepsinogen

14

Crypts of Lieberkuhn

The epithelia of the villi extend down into the lamina propria where they form crypts. Many important cells reside in the crypts, including those involed in host defense and signaling.

15

Taenia Coli

Three narrow bands of longitudinal muscle

16

Contrast vili vs plicae circulares.

Plicae circulars are are large valvular flaps projecting into the lumen of the small intestine that are covered with villi.

17

What cells make up the epithelium of the inside of the mouth and surface of the tongue?

Nonkeratinized stratified squamous epithelium

18

What is beneath the submucosa?

Muscularis externa

19

When is the outermost layer of tissue called serosa?

Call serosa if covered my mesothelium; adventitia otherwise

20

What is unique about the muscularis externa in the esophagus?

It has some skeletal muscle fibers

21

Cardia

1st part that is separated from the esophagus by the cardiac sphincter

22

Fundus and Body

Largest part of the stomach and the glands have parietal and chief cells

23

Pylorus

Glands are mainly mucus secreting with there being 2 specialized cells: G cells and D cells

24

What do D cells secrete?

Somatostatin

25

What do G cells secrete?

Gastrin

26

What color are the parietal cells?

Pink

27

What color are the chief cells?

Blue

28

What is the feature of the duodenum?

Brunner Glands

29

What is the feature of the jejunum?

Long villi and increased goblet cells – no Brunner glands or Peyer patches

30

What is the feature of the ileum?

Short villi, many goblet cells, and lymphatic nodules in the submucosa called Peyer patches

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