digestive tract/tube; alimentary canal/tube
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Introduction
The passage leading from the mouth to the anus through the pharynx, esophagus, stomach & intestine. 4 tunics in wall of digestive tube.
- Tunica mucosa
- Tunica submucosa - areolar connective tissue that contains blood & lymphatic vessels, nerves & glands.
- Tunica muscularis
- Tunic serosa or adventitia - outer layer of connective tissue