. Journal of anatomy . evelopment of the Maxillary Sinus. The development of the sinus is intimately connected with that of thecheek teeth. In it the temporary molars are formed and, later on, thepermanent bicuspids and molars ; and just as the alveolar process of the Anatomy and Pathology of the Maxillary Sinus 355 maxilla comes into existence for the express purpose of supporting theteeth, and is removed by absorption after their loss, so this cavity appearsto come into existence in order to contain the bony crypts of the developingcheek teeth, and to enlarge as the series increases in numbe
. Journal of anatomy . evelopment of the Maxillary Sinus. The development of the sinus is intimately connected with that of thecheek teeth. In it the temporary molars are formed and, later on, thepermanent bicuspids and molars ; and just as the alveolar process of the Anatomy and Pathology of the Maxillary Sinus 355 maxilla comes into existence for the express purpose of supporting theteeth, and is removed by absorption after their loss, so this cavity appearsto come into existence in order to contain the bony crypts of the developingcheek teeth, and to enlarge as the series increases in number, and finallyto be slowly filled up from below after their loss. During the formation and eruption of the milk molars the sinus iscomparatively small, only large enough, in fact, to contain the crypts of thedeveloping teeth. The posterior portion where the permanent molars willeventually be formed does not exist. Fig. 1 shows the condition in achild of about 5| years of age, in which the posterior limit of the maxilla. Fig. 1.—Section cut through both antra ^ in. above the level of nasal floor,in a child of 5^ years. is situated immediately behind the posterior margin of the crypt containingthe second permanent molar germ. I do not believe the canine is ever in any nearer relation to the cavitythan its anterior boundary. In the anthropoid apes the posterior bonywall of the long socket of the canine is always in front of the sinus. Thebicuspids occupy crypts in the sinus immediately over and between thetemporary molar roots. Before discussing the relations of individual teethto the maxillary sinus I propose to examine the relationship which iscommon to them all, from the first premolar to the tliird molar in thesecond dentition and the milk molars in the first. The relations of the temporary dentition to the antrum are shown inthe accompanying drawing (fig. 1), which shows a section cut transverselythrough both antra, about a quarter of an inch above the level of the floorof
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
