HTHSCI 1CC6 Lecture Notes - Lecture 23: Stratified Squamous Epithelium, Muscularis Mucosae, Simple Columnar Epithelium
25 Oct 2018
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Document Summary
It is a moist epithelial membrane that lines the alimentary canal lumen from mouth to anus functions: Absorb the end products of digestion into the blood. Except for the mouth, esophagus and anus, it is stratified squamous, whereas the epithelium of the mucosa is a simple columnar epithelium. The slipper mucus it produces, protects certain digestive organs from being digested by enzymes working within their cavities and eases food along the tract. The lamina propia: underlies the epithelium, is a loose areolar connective tissue. Its capillaries nourish the epithelium and absorb digested nutrients. External to the lamina is the muscularis mucosae, a scant layer of smooth muscle cells that produces local movement of the mucosa that can enhance absorption and secretion. Areolar connective tissue containing a rich blood supply and lymphatic vessels, lymphoid follicles and nerve fibers which supply the surrounding tissues of the gi tract.
