Histo - Stomach and Small Intestine - Downing

Question 1

This is a section of gastric glands

Which are the parietal cells?

Which are the chief cells?

Answer 1

Parietal cells are the horizontal arrows.

Diagonal arrow is dark chief cell

Question 2

What region of Gi is this section from?

Answer 2

Pyloric region (mucosa)

You can see those deep branching gastric pits

Question 3

What refion of GI tract?

Answer 3

cardiac region of stomach (mucosa)

Question 4

Gi region?

Answer 4

Fundus/Body of stomach mucosa

(big ol folds and pits)

Remember this is the only region where the gastric pits have parietal cells and chief cells along with the mucus cells that are in all the regions. (cardiac + pyloric)

Question 5

Important overarchign fact:

What are the four basic layers that are consistent in most of the digestive system?

Inner - to - outer

Answer 5

Mucosa - Submucosa, Muscularis Externa, Serosa (or adventitia)

Question 6

What part of Gi is this from?

Don’t have to specify too much.

Answer 6

small intestine

Question 7

This arrow is in what layer on the small intestine?

Answer 7

submucosa

Question 8

This is a section from the muscularis and serosa of the small intestine.

What does the blank arrow point to?

What are the layers of muscle in the picture?

Answer 8

Arrow points to the myenteric (Auerbach’s) plexus

Light layer on the bottom is the sclera

Just above sclera is the Outer Longitudinal Muscle layer (OLM)

Above that is the Inner Circular Muscle layer (ICM)

Question 9

Picture points to:

Answer 9

villus of intestine

can see light goblet cells in there too

Question 10

arrow points to:

Answer 10

Central lacteal of villus

Question 11

Another name for the intestinal glands of the small intestine:

Answer 11

crypts of Lieberkuhn

Question 12

What are the pink grainy cells in the picture?

What do they do?

Answer 12

Paneth Cells at the bases of intestinal glands

They control the microbial flora of the intestine

(the pink granules contain lysozyme for antibacterial activity)

Question 13

Where is this slide from?

What is the arrow pointing to?

Answer 13

Intestinal gland of the small intestines

Arrow points to a mitotic figure. Cells are dividing in this area to replace the absorptive and goblet cells

Question 14

What type of gland is in this picture?

What should you now know about the location?

Answer 14

It’s a Brunner’s gland

We are in the Duodenum, because that’s where you find Brunner’s glands :)

Question 15

Function of Brunner’s glands?

Answer 15

Alkaline secretions of mucus.

They help neutralize acidic material coming into the duodenum from the stomach.

So that makes sense they would be in the duodenum right?

That’s the part of the small intestine receiving the most acidic stuff.