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SCAN0102 - Lingual frenulum secures the tongue to the floor...

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Unformatted text preview: Lingual frenulum secures the tongue to the floor of the mouth Tongue Superior surface bears three types of papillae Filiform 0 give the tongue roughness and provide friction Fungiform O scattered widely over the tongue and give it a reddish hue Circumvallate 0 V—shaped row in back of tongue Sulcus terminalis 0 groove that separates the tongue into two areas: Anterior 2/3 residing in the oral cavity Posterior third residing in the oropharynx Tongue Salivary Glands Produce and secrete saliva that: Cleanses the mouth Moistens and dissolves food chemicals Aids in bolus formation Contains enzymes that break down starch Three pairs of extrinsic glands 0 parotid, submandibular, and sublingual Intrinsic salivary glands (buccal glands) 0 scattered throughout the oral mucosa Salivary Glands Parotid 0 lies anterior to the ear between the masseter muscle and skin Parotid duct 0 opens into the vestibule next to the second upper molar Submandibular 0 lies along the medial aspect of the mandibular body Its ducts open at the base of the lingual frenulum Sublingual 0 lies anterior to the submandibular gland under the tongue It opens via 10-12 ducts into the floor of the mouth Salivary Glands Saliva: Source and Composition Secreted from serous and mucous cells of salivary glands A 97-99.5% water, hypo—osmotic, slightly acidic solution containing Electrolytes 0 Na, K+, Clo, P0426, HCO; Digestive enzyme 0 salivary amylase Proteins 0 mucin, lysozyme, defensins, and IgA Metabolic wastes 9 urea and uric acid Control of Salivation Intrinsic glands keep the mouth moist Extrinsic salivary glands secrete serous, enzyme—rich saliva in response to: Ingested food which stimulates chemoreceptors and pressoreceptors The thought of food Strong sympathetic stimulation inhibits salivation and results in dry mouth Teeth Primary and permanent dentitions have formed by age 21 Primary 0 20 deciduous teeth that erupt at intervals between 6 and 24 months Permanent 0 enlarge and develop causing the root of deciduous teeth to be resorbed and fall out between the ages of 6 and 12 years All but the third molars have erupted by the end of adolescence There are usually 32 permanent teeth ...
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