Lecture 2- Layers of the gut

Question 1

how many layers

Answer 1

4

Question 2

name the layers of the gut from outermost to innermost

Answer 2

1. Serosa (visceral pleura)
2. External muscle layers
   - longitudinal muscle
   - myenteric plexus (Auberbachs)
   - ciricular muscle
   - submucosal plexus (Meisseners)
3. Submucosa
4. mucosa
   - Lamina propria
   - Epithelium

Question 3

serosa

Answer 3

• blood and lymph vessels and adipose tissue

- continuous with mesenteries

Question 4

external muscle (muscularis propria) layers made up of

Answer 4

1. Outer- longitudinal
2. Myenteric plexus (Auerbachs)
3. Inner- circular
4. Mucosal plexus (Meissners)

Question 5

Submucosa

Answer 5

o Blood vessels, glands, lymph tissues, submucosal plexus

• dense connective tissue
• contains meissners plexus

Question 6

Muscularis mucosa

Answer 6

 Lots of smooth muscle oriented in diff directions

 Keeps epithelium in contact with gut content and crypts in contact

Question 7

Lamina propria

Answer 7

 Lymph nodules and Macrophages
 Produces antibodies (IgA- which is resistant to proteases)
 Protects us from microbes

Question 8

mucosal layers from outer to inner

Answer 8

muscularis mucosa
lamina propria
epithelial layer

Question 9

mucosa

Answer 9

 Transport and digestion of food
 Absorption
 Produces mucus and hormones