文档介绍：The Alimentary positionDigestive tube 消化管?Mouth 口腔?Pharynx 咽?Esophagus 食管?Stomach 胃?Small intestine小肠?Large intestine 大肠Duodenum 十二指肠Jejunum 空肠Ileum 回肠Digestive glands 消化腺Superior digestive tube上消化道Inferior digestive tube下消化道?Major salivary glands 大唾液腺?Liver 肝?Pancreas 胰Function: ingestion, digestion, absorption, egestingMouthPharynxEsophagusStomachDuodenumJejunumIleumLarge intestineLiverPancreasMajor salivary glandsThe Oral Cavity 口腔Consists of two parts?Oral vestibule 口腔前庭: between cheeks and lip and teeth?Oral cavity proper固有口腔: within arch of teeth Boundaries?Anterior and lateral: gum and teeth?Posterior: isthmus of fauces?Roof: palate ?Floor: tongue, muscles and mucous membraneOral vestibule leads, by the space behind the molar teeth, into the oral cavity properPalate 腭Two parts?Hard palate: anterior 2/3, formed by the maxilla and palatine bone?Soft palate: posterior 1/3?Velum palatinum腭帆?Uvula 腭垂?Palatoglossal arch 腭舌弓?Palatopharyngeal arch腭咽弓Isthmus of fauces咽峡formed by posterior border of velum palatinum, both side of palatoglossal arches, and root of 牙General features?Two sets: ?Deciduous 乳牙?Permanent 恒牙?Classification: ?Incisors 切牙?Canine 尖牙?Premolars 前磨牙?Molars 磨牙Deciduous teeth: are 20 in number?Ten teeth in each mandibular and maxillary arch ?Central incisor中切牙, lateral incisor侧切牙, canine尖牙, first molar第一磨牙and second molar第二磨牙in each quadrantUpper jaw ⅠⅡⅢⅣⅤ total 20Lower jaw in. in. can. mol. mol. ?Eruption: stars at about 6 mouth of age and continues to beginning of 3rd year?Shedding: occurs between 6th and 12th years with replacement by permanent teethPermanent teeth (adult): are 32 in number ?Sixteen in each mandibular and maxillary arch?Two incisors, one canine, two premolars, and three molars in each quadrant Upper jaw 1 2 3 4 5 6 7 8 total 32 Lower jaw ?First permanent molar-appears at about 6 years?Third molars (wisdom teeth)-many erupt at any time after 12 years of age or not at all (i