BIOL-242 Lecture Notes - Lecture 40: Stratified Squamous Epithelium, Soft Palate, Hard Palate
10 Jun 2020
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Chapter 23 part 2 |function anatomy - the mouth. Bounded by lips, cheeks, palate, and tongue. Hard palate - palatine bones and palatine processes of maxillae. Slightly corrugated to help create friction against tongue. Soft palate - fold formed mostly of skeletal muscle. Uvula projects downward from its free edge. Produce most saliva ; lie outside oral cavity. Anterior to ear; external to masseter muscle. Lysozyme, iga, defensins, and a cyanide compound protect against microorganisms. Extrinsic salivary glands activated by parasympathetic nervous system when. Ingested food stimulates chemoreceptors and mechanoreceptors in mouth . Salivatory nuclei in brainstem send impulses along parasympathetic fibers. Strong sympathetic stimulation inhibits salivation and results in dry mouth. Covered by enamel hardest substance in body (calcium salts and. Enamel-producing cells degenerate when tooth erupts no healing if decay or crack. Covers root; attaches it to periodontal ligament. Gingival sulcus - groove where gingiva borders tooth.
