Anatomy Essays exam III - Deanna Boone Anatomy and...

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Deanna Boone Anatomy and Physiology Carr-MWF 12PM Extra credit essays 3, 5 and 6 3. describe the digestive tract in detail, including any changes in the mucosa, submusocsa, amd musclaris along its length. Also, include the possible movements that one has along particular sections of its length In the esophagus, the mucosa conssits of nonkeratinized stratified squamous epitheliam, lamina propria and muscularis muscosae. Near the stomach, the mucosa of the esophagus also contains mucous glands. There is a layer of submucosa composed of aerolar connective tissue, blood vessels and mucous glands. The muscularis of the superior third of the esophagus conis made up of skeletal muscle. The middle third is comprised of skeletal and smooth muscle while the inferior third is smooth muscle. The muscularis at the each of the end is more prominent, forming sphincters consisting of smooth muscle.The deglutition movements associated with the esophagus are called peristalsis. In the stomach, the surface is composed of mucosa which is a layer of of simple columnar epithelial cells. The mucosa consists of a lamina propria and a muscularis mucosae. The lamina propria contains epithelial cells that extend down to form columns of gastic glands that line channels called gastric pits. Deep to the mucosa are three layers, submucosa composed of areolar connective tissue, muscularis with three layers of smooth muscle and serosa made of simple squamous epitheliam and areolar connective tissue. The movements of the stomach are generalyl in mixing waves. The small intestine is composed of the same four layers. The mucosa layer is made of layers of epitheliam, lamina propria and muscularis mucosae. The epithelium is simple columnar with cells such as goblet celsl that secrete mucus. The lamina propria contains areolar connective tissue and has an abundance of MALT cells. The muscularis mucosae is made of smooth muscle. The submucosa contains duodenal galnds that secret alkaline mucus. The muscularis contains two layers, an outer layer with longitundinal fibers and an inner layer with thicker circular fibers. The small intestine caontain the same four basic layers in addition to circular folds, villi and microvilli in order to facilitlate the process of digestion and absorption. Movement of the small intestine include segmentations and migrating motility complexes. The large intestine is lined with the four basic layers. The
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This note was uploaded on 04/18/2008 for the course BIO 3040 taught by Professor Carr during the Spring '08 term at Palm Beach Atlantic University.

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Anatomy Essays exam III - Deanna Boone Anatomy and...

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