BIOL 143 Chapter Notes - Chapter 38: Sine Wave, Dentin, Permanent Teeth
29 Mar 2017
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Document Summary
Areolar connective tissue with blood vessels; lymphoid follicles (especially as tonsils and mucosa- associated lymphoid tissue (malt) Areolar and dense irregular connective tissue containing blood vessels, lymphatic vessels, and nerve fibers (submucosal nerve plexus) Elastic fibers help maintain the shape of each organ. Segmentation and peristalsis of digested food along the tract are regulated by the myenteric nerve plexus. Reduces friction as the digestive system organs slide across one another. Two sets of teeth have developed by age 21. Deciduous (milk) teeth = initial set; appear between age of 6 months - 2. 5 years. Permanent teeth = second set of teeth used in biting; chisel-shaped used in tearing food; cone-shaped used in grinding food; two cusps. Third molars (wisdom teeth) (cid:0) used in fine grinding of food; broad crowns with rounded cusps never erupt. Crown (cid:0) superior portion of tooth; visible above gum/gingiva (surrounds tooth) Surface covered in enamel (consists of 95-97% calcium salts/heavily mineralized)
