Dental cosmos . f of the mouth at the region of the incisors and the * Some of the figures show neck-folds, which must not be confounded with rugae. PERISCOPE. 69 bicuspids is distinguished from that of the molars by the presenceof folds of gum-tissue placed at the necks of the teeth. These mayreceive the names of the neck-folds. They indicate a disposition ofthe mucous membrane to be in excess at the parts where the palateis the narrowest. They often entirely occupy the pre-sutural ruga?, as a whole, are the best developed in the regions wherethe neck-folds are found. Each palatal r
Dental cosmos . f of the mouth at the region of the incisors and the * Some of the figures show neck-folds, which must not be confounded with rugae. PERISCOPE. 69 bicuspids is distinguished from that of the molars by the presenceof folds of gum-tissue placed at the necks of the teeth. These mayreceive the names of the neck-folds. They indicate a disposition ofthe mucous membrane to be in excess at the parts where the palateis the narrowest. They often entirely occupy the pre-sutural ruga?, as a whole, are the best developed in the regions wherethe neck-folds are found. Each palatal ruga is divided into a median and a lateral median part, as a rule, is crescentic in outline with the convexitydirected forwards. The lateral is directed forwards. Taken to-gether the last-named folds are arranged in vertical series { withthe main axes of the crowns of the teeth), and are either separatedby intervals of equal size or are clustered at the alveolar borderopposite the bicuspids. Fig. The palate is moderately high arched. The lateral elements are elongated. The median elementsare either too faint to be apparent or are absent. The right lateral iucisor is absent and the incisive pad shows an inclination to the side of left sutural fold is directed backward at the raphe. When the two parts (the median and the lateral) are contiguousthe ruga? may be said to be entire. But when the}7 are separatedby intervals more or less appreciable they may be said to be palates of a moderate curvature, midway between the flat andthe high vaults, the folds may be evenly disposed and be withoutbreak on one side while they are irregular and broken on the left side is commonly the most developed, a feature which therugae exhibit in common with the mandible, the left ramus of whichis commonly the larger. An elliptical exostosis which is often met with on the roof of themouth is almost always larger on the left side. The left suturalruga
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