Esophagus: the esophagus is a fixed muscular tube that delivers food and liquid from the pharynx to the stomach
Submucosa: the submucosa consists of a dense irregular connective tissue layer containing blood and lymphatic vessels, a nerve plexus, and occasional glands
Muscularis externa: in most parts of the digestive tract the muscularis externa consists of two concentric and relatively thick layers of smooth muscle
Mucosa: the mucosa consists of a lining epithelium, an underlying connective tissue called the lamina propria and the muscularis mucosa composed of smooth muscle
Serosa: the serosa is a serous membrane consisting of a simple squamous epithelium the mesothelium and a small amount of underlying connective tissue
Gastric Mucosa: longitudinal submucosal folds, rugae, allow the stomach to distend when filled
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