Dental cosmos . oruspalatinus.* * For reference to torus palatums see W. Sommer, Virchows Archiv, 1883,vol. xciv, 21. OS THE DENTAL COSMOS. The largest transverse fold lies between the cuspid teeth or betweenthem and the first bicuspid, and answers to the suture between themaxilla and the premaxilla. It will receive here the name of thesutured ruga. The sutural ruga is the widest of any in the entireseries. It is usually inclined somewhat backward, but neverforward. A deep sulcus is often seen at the base of the sutural foldanteriorly. The sutural fold divides the hard palate into two parts, t
Dental cosmos . oruspalatinus.* * For reference to torus palatums see W. Sommer, Virchows Archiv, 1883,vol. xciv, 21. OS THE DENTAL COSMOS. The largest transverse fold lies between the cuspid teeth or betweenthem and the first bicuspid, and answers to the suture between themaxilla and the premaxilla. It will receive here the name of thesutured ruga. The sutural ruga is the widest of any in the entireseries. It is usually inclined somewhat backward, but neverforward. A deep sulcus is often seen at the base of the sutural foldanteriorly. The sutural fold divides the hard palate into two parts, the pre-sutural and the post-sutural. The pre-sutural space thus answers tothe premaxilla and has but one ruga* (see Fig. 2). The post-suturalspace has four to seven ruga?, which are named in order from beforebackward, the first, second, third, fourth, etc. Of these folds thethird is the best developed. As a rule the first and the second arethe least so, and are represented usually by small nodules, or by Fig. The arch is flat and wide, the rugae entire ; no hyperostosis is present; moderate lateral concrescenceis seen on the left side. groups of papules, at the outer portion of the vault. They are oftenaborted. The fifth, sixth, and seventh are also often aborted orrepresented by faintly expressed broken sinuate lines. The presu-tural portion of the vault is nearl} flat, and is of a special use inpresenting a firm surface for the tip of the tongue to press againstin mastication and in speech. The post-sutural space is concavewith an abrupt declivity forwards. The alveolar processes of themolar range and the declivity named bound the true palatal presents extraordinary varieties, no two subjects being in allrespects the same. The pre-sutural rugae were found in an examination of 90 examplesof hard palates, present on the right side alone in 11, on the left sidealone in 1, on both sides 17, absent in 50, doubtful in 11. Occasion-ally a system of minute raised folds e
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