**The Digestive System

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The Four Layer Walls

from outermost to innermost the serosa (also called the peritoneum), the muscular layer, the submucosa, and the mucosa. Table 30-1 describes these four layers of the digestive tract wall.

Salivary Glands

Serosa

Submucosa

Mucosa

the Muscular layer

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Tongue

Sublingual

Submandibular

Parotid gland

Parotid duct

Pharynx

Esophagus

Fundus is the upper portion of stomach

Spleen sit's to the left of the stomach

Body- Middle portion of stomach

Three types of digestive enzymes: protease, amylase, and lipase.