. A treatise on practical anatomy: for students of anatomy and surgery . andrich in mucous glands. O^^osite^the^^seco]^^^molar is a papilla, which presents the opening of theparotid duct; on the floor of the mouth, at each side ofthe fraenum linguae, is the opening of Whartons duct,the duct of the submaxillary gland. The ducts of thesublingual gland, eight to fifteen in number, open on thefloor of the mouth. The gums are fibrous structures,closely attached to the periosteum, and covered by thelining mucous membrane, which is intimately adherent. THE TEETH. 351 THE TEETH.* Human teeth are o:5se
. A treatise on practical anatomy: for students of anatomy and surgery . andrich in mucous glands. O^^osite^the^^seco]^^^molar is a papilla, which presents the opening of theparotid duct; on the floor of the mouth, at each side ofthe fraenum linguae, is the opening of Whartons duct,the duct of the submaxillary gland. The ducts of thesublingual gland, eight to fifteen in number, open on thefloor of the mouth. The gums are fibrous structures,closely attached to the periosteum, and covered by thelining mucous membrane, which is intimately adherent. THE TEETH. 351 THE TEETH.* Human teeth are o:5seous in character and are ivory-hke bodies, placed in the jaws for the purposes of masti-cation, articulation, and contour. Normally fifty-twoteeth make their appearance during life; these aredivided into two sets, for child and adult life. The first,known as the primary, temporary, deciduous, or milk setof teeth, consists of twenty—ten for either jaw. Thesecond, or permanent, consists of thirty-two, of whichthe first tooth making its appearance is the first or six-. FiG. 152.—Temporary Teeth. year-old molar, so named because it erupts about thesixth year. The temporary teeth are classified on each side, fromthe median line backward, into two incisors (one centraland one lateral incisor), one cuspid or canine, and twomolars, the first and second, in each jaw. In the permanent set the incisors and cuspids corre-spond in number and position to those of the temporary,but tlie molars are replaced by the first and secondbicuspids or premolars, and posterior to these we findthe first, second, and third molars; the third molar isoften termed the dens sapientiae, or wisdom tooth. *The section on the teeth has been prepared by T. S. Heinekeu, , ofNew Jersey, and E. E. Caspersonii, , of Australia. 352 PRACTICAL ANATOMY. A tooth is said to consist of a crown, neck, and rootor roots. The crown is all that portion found normallyabove the gum; the neck the narrow, constricted
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomy, bookyear1891
