NATS 1675 Lecture Notes - Lecture 9: Esophagus, Gastric Pits, Gastric Glands
17 Mar 2016
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Anus: ds2--the cavity of the digestive tract is called the lumen, ds3--the walls of the digestive tract consist of 4 layers, 1. The lumen is lined with the mucosa (a mucus membrane). Some areas of the mucosa secrete digestive enzymes into the lumen; other areas of the lumen receive digestive enzymes from other glands: 2. The second layer is the submucosa, which contains blood vessels, lymphatic vessels and nerves: 3. 2 third layer is the muscularis made up of an inner layer of circular muscles and an outer layer of smooth longitudinal muscle (see pp. 72 -73 for muscle types); the muscularis is responsible for peristalsis; and: 4. The serosa, which is the thin outermost covering. Grinding: the teeth with the aid of the tongue reduce food particles sufficiently so they can be easily swallowed, chewing also helps mix the food with saliva and this begins the process of starch digestion.
