- What are the layers of esophagus?
- From lumen outwards
- Mucosa
- Submucosa
- Muscularis externa
- Serosa or adventitia
- Name the layers of mucosa?
- Epithelial layer lined by stratified squamous non-keratinized epithelium
- Lamina propria
- Muscularis mucosa
- Why is it lined by stratified squamous non-keratinized epithelium?
- It protects the esophagus from physical wear and tear occurring when it comes in contact with various types of food (hot, cold, spicy, junk)
- What are the components of lamina propria?
- Loose connective tissue
- Blood vessels
- Nerves
- Lymphatics
- Smooth muscle cells
- What is muscularis mucosae?
- Muscularis mucosae is a thin layer of smooth muscle arranged as longitudinal layer around the lamina propria
- what are the components of submucosa?
- Dense connective tissue
- Larger blood vessels
- Mucosal or esophageal glands
- Submucosal or Meissner's plexus of autonomic nerves
- What are the components of muscularis externa?
- In the upper 1/3rd skeletal muscle layer
- In the middle 1/3rd smooth and skeletal muscle layer
- In the lower 1/3rd only smooth muscle layer
- Myenteric (Auerbach's) plexus of autonomic nerves along thin layer of connective tissue
- What is serosa or adventitia?
- Abdominal part of esophagus: Serosa
- Thoracic part of esophagus: Adventitia
- Difference between serosa and adventitia
Serosa
|
Adventitia
|
Thin layer of loose connective tissue with numerous blood vessels, lymphatics, adipose tissue covered by simple squamous epithelium (mesothelium)
|
Loose connective tissue with numerous blood vessels, lymphatics, adipose tissue which merges with surrounding tissues. Mesothelium is absent
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10. What is mesothelium?
- It is a simple squamous epithelium covering a thin layer of loose connective tissue in the abdomen surrounding the viscera
- Meissner’s plexus regulates the configuration of the luminal surface, controls glandular secretions, alters electrolyte and water transport and regulates local blood flow
12. What is the function of Myenteric plexus?
- Myenteric plexus supplies the GIT and controls the gastric motility
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