7. Digestive tract anatomy Flashcards Preview

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Flashcards in 7. Digestive tract anatomy Deck (22):
1

Layers of gastrointestina tract - inside to outer

1. Mucosa
2. Submucosa
3. Muscularis externa
4. Serosa ( when intraperitoneal ) , adventitia when retroperitoneal

2

gi tract - mucosa - inner to outer

epithelium , lamina propria , muscularis mucosa

3

gi tract - submucosa ?

- includes submucosal nerve plexus ( Meissner )
-secretes fluids ( submucosal glands )

4

gi muscularis externa

- includes myenteric nerve plexus ( auerbach )
- motility

5

Messiner vs Auerbach nervers plexus according to the name and location

Meissner --> submucosal nerve plexus ( submucosa)
auerbach --> myenteric nerve plexus ( muscularis externa

6

gi tract - muscularis externa inner to outer

1. inner circular layer
2. myenteric nerve plexus ( AUerbach)
3. outer logitudial layer

7

Ulcers vs erosions

ulcers extend into submucosa , inner or outer musular layer
erosions are in mucosa only

8

gi tract - serosa contains

vein , artery , lumph vessels

9

gi tract - frequency of basal electric rhythm ( slow waves )

1. stomach - 3 waves / min
2. duodenum -12 waves / min
3. ileum - 8-9 waves / min

10

gi tract - slow waves originate in

the intestinal cell of Cajal ( pacemaker for GI SMCs)

11

• Which layer of the muscularis externa is closer to the gut lumen: the circular layer or the longitudinal layer?

The circular layer

12

• List the three components of the gut wall mucosa.

Epithelium, lamina propria, and muscularis mucosa

13

• What is the primary function of the epithelium of the gut wall mucosa?

Absorption

14

• What is the primary function of the lamina propria of the gut wall mucosa?

Support

15

• What is the primary function of the muscularis mucosa of the gut wall mucosa?

Mucosal motility

16

• If a patient is missing his submucosal nerve plexus, which gut function would be impaired?

Secretory activity (the Submucosa contains the Submucosal plexus, also known as the Meissner plexus)

17

• Which nerve plexus lies between the inner circular and outer longitudinal layers of the muscularis externa?

The Muscularis externa contains the Myenteric nerve plexus (also known as the Auerbach plexus), responsible for Motility

18

• List the four main layers of the gut wall, starting from the lumen.

Mucosa, submucosa, muscularis externa, and serosa

19

• List the basal electric rhythms of the stomach, duodenum, and ileum.

Stomach = 3 waves/min, duodenum = 12 waves/min, and ileum = 8–9 waves/min

20

• What layer(s) can ulcers extend into?

Submucosa, inner or outer muscular layer

21

• What is the outermost layer of the gut called when retroperitoneal?

Adventitia (the GI serosa exists only in the peritoneal cavity)

22

• A patient thinks he has erosions. In which layer of the gut are these typically found?

Mucosa only

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