Which layer of the alimentary canal is constructed from either stratified squamous or simple columnar epithelium?

Mucosa

Explanation:

The gastrointestinal tract or alimentary canal consists of four main layers:

• Mucosa - consists of the epithelium (it can be stratified squamous or simple columnar epithelium) together with glandular tissue and the lamina propria (connective tissue)

• Submuscosa - consists of fibrous connective tissue with larger blood vessels, lymphatics, nerves ...

• Muscularis externa-smooth muscle layer that consists of three layers, responsible for movement (propulsion) and physical break down of the food

• Serosa-consists of connective tissue continuous with the peritoneum.