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 | epithelium - stratified squamous lines the
mouth, pharynx, esophagus and anus. Simple columnar lines the
stomach and intestine. |
| loose connective tissue |
| glands (if present) |
Submucosa - tough layer of dense connective tissue
| skeletal (voluntary) muscle in the mouth, pharynx, cranial esophagus and external anal sphincter |
| smooth (involuntary) muscle in the rest of the digestive tube |
Serosa - this is an outer connective tissue covering. In the abdominal cavity this is covered by a thin layer of visceral peritoneum.
