. The Dental cosmos. 512 THE DENTAL COSMOS. ship of structure and function in theseassociated structures is self-evident. For example, in Fig. 2 a considerablevariation in the anatomical region underdiscussion is shown. Observe the narrowand high maxillary arch, and, in thenasal meati above, a serious obstructionto nasal breathing on one side, caused bythe deflection of the nasal septum, alsothe small antral sinuses, indicating lackof full development. Even the orbital TYPAL VARIATIONS AND PREDISPOSITIONS. When we further consider some ofthese anatomical variations of the inter-nal face with r
. The Dental cosmos. 512 THE DENTAL COSMOS. ship of structure and function in theseassociated structures is self-evident. For example, in Fig. 2 a considerablevariation in the anatomical region underdiscussion is shown. Observe the narrowand high maxillary arch, and, in thenasal meati above, a serious obstructionto nasal breathing on one side, caused bythe deflection of the nasal septum, alsothe small antral sinuses, indicating lackof full development. Even the orbital TYPAL VARIATIONS AND PREDISPOSITIONS. When we further consider some ofthese anatomical variations of the inter-nal face with reference to the type ofhead in which they occur, a peculiar andimportant relationship of the correlatedinternal structures of the maxillary ar-ches and nasal structures will be example, there are certain types ofindividuals with the dolichocephalic type Fig. -Cryer. cavities are of unequal depth, indicatinga general lack of harmonious bilateraldevelopment of the upper part of the face. Again, we might compare two verticaltransverse sections made from differentskulls in about the same anatomical re-gion (Fig. 3), differentiating in the upperone large, well-developed nasal sinuses,and in the lower one small, undevelopednasal sinuses having very little air-spaceand hence deficient respiratory of the sinuses of the upper section,excepl the maxillary sinus, are largerthai! those of the lower seel ion, whichindicates greater internal facial develop-nient, better fund ioning and more pro-portionate externa] facial symmetry in 1 he upper sec! ion. of head, or long and narrow skull, thatmay be said to be anatomically predis-posed to deficient nasal and maxillarydevelopment in comparison with in-dividuals of the brachycephalic or meso-cephalic type with short broad skulls. Take for illustration the two sectionsof skulls shown in Figs.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentist, bookyear1912
