. Cunningham's Text-book of anatomy. Anatomy. -THE FACE. 1381 Suture between premaxilla and vomer Left nasal cavity ., Xasal septum. Palatine process of maxilla .Horizontal plate of palate bone Fig. 1082. — Shows Arrangement of Bones in Double Cleft Palate {Handbook of Practical Surgery, Bergmann, Brans, and Mikulicz). vomer (Fig. 1082). If the premaxillary projection be removed altogether, there is nothing left to support the upper lip, and the result is an ugly deformity, due to the comparative protrusion and redundancy of the lower lip. /^^k f 1£ __. Premaxilla Teeth. —The milk teeth begin
. Cunningham's Text-book of anatomy. Anatomy. -THE FACE. 1381 Suture between premaxilla and vomer Left nasal cavity ., Xasal septum. Palatine process of maxilla .Horizontal plate of palate bone Fig. 1082. — Shows Arrangement of Bones in Double Cleft Palate {Handbook of Practical Surgery, Bergmann, Brans, and Mikulicz). vomer (Fig. 1082). If the premaxillary projection be removed altogether, there is nothing left to support the upper lip, and the result is an ugly deformity, due to the comparative protrusion and redundancy of the lower lip. /^^k f 1£ __. Premaxilla Teeth. —The milk teeth begin to appear from the sixth to the eighth month, the first to emerge being the lower central incisors. The first denti- tion is completed about the thirtieth month. Delayed dentition is gen- erally due to rickets. Of the permanent set the first to erupt are the first molars, which appear at the end of the sixth or seventh year; the third molars, the last to appear, may erupt any time be- tween the eighteenth and the twenty-fifth year, or even later. As the permanent teeth push their way towards the surface, absorption of the roots of the first set takes place, which either fall out of their own accord or are easily removed. Loss of the permanent teeth is followed by absorption of the alveolar margin of the jaw. The tooth sockets are lined by a thin periosteum, which is anatomically continuous with the pulp tissue of the teeth on the one hand and the dense fibrous tissue of the deep layer of the gum on the other. The upper incisors and canines and the lower bicuspids have cylindrical roots, hence in extracting these teeth they should be first loosened by a slight rotatory movement; the roots of the lower incisors and canines and of the upper bicuspids are flattened,, so that they must be loosened by a lateral movement. The roots of the third molars are convergent, generally welded together and curved backwards, especially in the mandible. The first and second upper molars have
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
