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Slide 31: Oesophagus
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H/E
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This specimen is a section through the oesophagus. It is used to study the histology of the oesophagus and serves as an example of thick stratified squamous unkeratinizing epithelium.
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Identify:
Macroscopic
The circular oesophagus The lumen Mucosa Submucosa M. extern a Adventitia
Microscopic
The different layers of the epithelium. The shape of the cells in the different layers. The different layers of the oesophagus.
Draw and annotate:
A line diagram of the oesophagus.
A few epithelial cells of each layer to show the different cell shapes.
Reflection:
- How many cell layers are present between the basal lamina and lumen?
- How thick is each one of the different layers in relation to one another?
- How does the shape of the cells in each layer change?
- What is characteristic of the junction between this epithelium and the underlying support structures (connective tissue)? Are there connective tissue papillae present?
- How does this junction appear in longitudinal as well as cross section?
- What is typical of the lumen?
- Which layers form the mucosa?
- What glands are found in the mucosa?
- What type of connective tissue forms the submucosa?
- What glands are found in the submucosa?
- What types of muscle are found in the M. externa, and where?
- What type of tissue forms the adventitia?
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