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Unformatted text preview: 1 Chapter # 7 - Pages 928 to 954 Oral region includes 1. oral cavity ( mouth ) 2. teeth 3. gingivae ( gums ) 4. tongue 5. palate 6. palatine tonsils Oral cavity consists of two parts 1. oral vestibule is a slitlike space between the teeth and buccal gingival, lips and cheeks 2. oral cavity proper Oral vestibule 1. is a slitlike space between the teeth and buccal gingival, lips and cheeks 2. it communicates with the exterior through the mouth 3. the size of this oriFce is controlled by the orbicularis oris, the sphincter of the oral aperture Oral cavity proper 1. is the space between the upper and lower dental arches 1. the roof of the oral cavity is formed by the palate 3. posteriorly, the oral cavity communicates with the orpharynx Upper lip 1. supplied by the superior labial artery, branch of facial artery 2. nerve supply is by the infraorbital nerve , branch of maxillary nerve Lower lip 1. supplied by the inferior labial artery ( branch of facial artery ) and mental artery is a branch of inferior alveolar artery 2. nerve supply is by mental nerve , branch of inferior alveolar nerve Cheeks 1. form the lateral movable walls of the oral cavity and formed by the prominences of the zygomatic bones 2. the principal muscle of the cheek is the buccinator 3. superFcial to the buccinator, is an encapsulated collection of fat, buccal fatpad Teeth Children have 20 teeth Adults have 32 secondary teeth / permanent teeth Vasculature of the maxillary and mandibular teeth 1. superior alveolar artery ( branch of maxillary artery ) 2. inferior alveolar artery ( branch of maxillary artery ) Veins accompany the arteries Nerve supply 1. superior alveolar nerve ( branch of maxillary nerve 2. inferior alveolar nerve ( branch of mandibular nerve ) 2 Palate forms the arched roof of the mouth and the Foor of the nasal cavities It has two regions 1. hard palate ( anterior two - thirds ) 2. soft palate ( posterior one - third ) Hard palate 1. palatine processes of maxilla 2. horizontal plates of palatine bone Three foramina in the hard palate 1. incisive fossa of the maxilla is a slight depression posterior to the central incisor teeth, transmits the nasopaltine nerves 2. greater palatine foramen pierces the lateral border of the bony palate, transmits the greater palatine nerve and vessels 3. lesser palatine foramen lies posterior to the greater palatine foramen, transmits the lesser palatine nerve and vessels Soft palate 1. is the movable posterior posterior third of the palate 2. it is suspended from the posterior border of the hard palate 3. it has no bony skeleton, but made of muscles and aponeurosis 4. uvula is the conical process hanging from the posteroinferior end of the soft palate 5. when a person swallows, the soft palate initially is tensed to allow the tongue to press against it, squeezing the bolus of food to the back of the mouth 6. the soft palate then is elevated posteriorly and superiorly against the wall of the pharynx, thereby preventing passage of food into the nasal cavity...
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- Winter '11