What is the tissue that lines the digestive tract?

Answer 1

The oesophagus is the first part of the digestive tract proper and shares its distinctive structure.
Basic tissue layers of the gut are
1. mucosa. Innermost, moist lining membrane. Epithelium (friction resistant stratified squamous in oesophagus, simple beyond) plus a little connective tissue and smooth muscle.
2. submucosa. Soft connective tissue layer, blood vessels, nerves, lymphatics
3. muscularis externa. Typically circular inner layer, longitudinal outer layer of smooth muscle
4. serosal fluid producing single layer.