Class 3 - Station 3: Histology of the Gut Tube Flashcards
What organ is shown here and how can you tell?
Oesophagus
- Stratified squamous epithelium
- Large muscularis externa
- No crypts and few glands
- Can be ducts
What muscle type forms the muscularis externa of the proximal 1/3rd of the oesophagus?
Skeletal
What muscle type forms the muscularis externa of the middle 1/3rd of the oesophagus?
Skeletal and smooth
What muscle type forms the muscularis externa of the distal 1/3rd of the oesophagus?
Smooth
What organ is shown here and how can you tell?
Stomach
- Evidence of gastric pits
What organ is shown here and how can you tell?
Stomach
- Gastric pits
- Thick MM
Stomach
Stomach Muscle
What secretory cells are located in the gastric pits?
- Parietal cells
- Chief cells
- Mucus cells at the top
- G cells
Rugae
What part of the small intestine is shown here and how can you tell?
Duodenum
- Brunners glands present in SUBMUCOSA
- Only the oesophagus and duodenum contain glands in the submucosa so look for glands first then at the epithelium
- Villi in this portion tend to be shorter with flatter tops than the ileum.
What part of the small intestine is shown here and how can you tell?
Jejunum
- No brunners glands
- No payer’s patches
- Evident plicae circulae = MORE COMMON IN JEJUNUM
Jejunum
What part of the small intestine is shown here and how can you tell?
Ileum
- Extensive payers patches
- No brunners glands
- Less plicae circulae
What type of epithelium is present in the villi?
Simple columnar
What type of muscle is found in the muscularis externa of the small intestine?
Smooth
What are the crypts of lieberkuhn?
- Crypts present in the duodenum
- Secretory
How far down do the crypts of lieberkuhn extend?
Muscularis mucosae
What cells are present in the crypts of lieberkuhn?
- Goblet cells
- Enterocytes
- Stem cells
What layer are peyers patches found in?
Submucosa
What part of the gut tube is shown here and how can you tell?
Colon
- Deep straight crypts lined with goblet cells
What part of the gut tube is shown here and how can you tell?
Colon
- Long straight crypts with GOBLET CELLS
What part of the gut tube is shown here and how can you tell?
Duodenum
- Submucosal brunners glands
- Villi
What part of the gut tube is shown here and how can you tell?
Ileum
- Peyers patches in Submucosa
- Villi
What part of the gut tube is shown here and how can you tell?
Anorectal junction
- Goblet cell crypts present in the proximal section with columnar epithelium
- Change to stratified squamous epithelium distally = ANAL CANAL
