Histology of the Gut Tube

Question 1

what does this histological image depict?
note the different epithelium types

Answer 1

gastro-oesophageal junction

Question 2

what GI organ is this histological image from?

Answer 2

stomach wall

Question 3

what GI organ is this mucosa present?

Answer 3

stomach

Question 4

what GI organ is this histology image from? give reasoning

Answer 4

small intestine:
- villi
- columnar epithelium with stiated borders.
- goblet cells.
- short tubular intestinal glands (Crypts of Leiberkuhn).

Question 5

what area of the small intestine is this histological image from?

Answer 5

duodenum

Question 6

what area of the GI tract is this mucosa present in?

Answer 6

large intestine

Question 7

what area of the GI tract has this histology?

Answer 7

large intestine

Question 8

Which GI organ is this histology from? give some identifying features

Answer 8

oesophagus:
- stratified squamous non-keratanised epithelium.
- submucosa shows mucous glands.
- THICK muscular layer - upper 1/3 skeletal, middle 1/3 smooth + skeletal, lower 1/3 smooth.

Question 9

From which GI organ is this surface epithelium present? give some identifying features.

Answer 9

stomach:
- epithelium is simple columnar.
- mucous does not take up H+E stain > epithelium looks very pale staining.

Question 10

From which GI organ is this histology present? give reasons for answer

Answer 10

stomach:
- simple columnar epithelium.
- mucous staining pale.
- fried egg shape and pink parietal cells.

Question 11

In which part of the small intestine is this histology present?
Give reasons for your answer.

Answer 11

duodenum:
- Brunner’s glands present in submucosa.
- glands extend down beyond the muscularis mucosae into the submucosa.
- short leaf-shaped villi,abundant and closely packed of varying height.

Question 12

In which part of the small intestine is this histology present?

Answer 12

duodenum
- presence of Brunner’s glands in submucosa.

Question 13

In which part of the small intestine is this histology present? what is your reasoning?

Answer 13

Ileum:
- thin finger-shaped villi, less abundant.
- lots of Peyers patches.

Question 14

in which part of the small intestine is this histology present? what is the reasoning?

Answer 14

jejunum:
- tongue-shaped villi with swollen ends, less abundant and of different heights.
- absent or rare lymphoid aggregation in lamina propria.
- no mucous glands in submucosa.

Question 15

in which part of the GI tract is this histology present? give reasons

Answer 15

large intestine:
- thick mucosa.
- crypts.
- mucous secreting cells.
- no villi.

Question 16

In which organ is this histology present? label the image

Answer 16

pancreas:
1 = islet of langerhans > endocrine part - no acini.
2 = exocrine part - pancreatic acini.
3= pancreatic duct (for exocrine part).

Question 17

in which organ is this histology present?

Answer 17

liver

Question 18

in which organ is this histology present?

Answer 18

liver

Question 19

GI tract mucosa undergoes abrupt transition from one form to another at 4 junctions:

Answer 19

• gastro-oesophageal
• gastro-duodenal
• ileocecal
• recto-anal

Question 20

what junction is this histology present?

Answer 20

ano-rectal

Question 21

from which organ is this histology present?

Answer 21

liver

Question 22

from which organ is this histology present?

Answer 22

pancreas

Question 23

from which organ is this histology present?
what does WP and RP mean?

Answer 23

spleen
WP = white pulp > contains lymphoid aggregations.
RP = red pulp > contains vasculature.