. Journal of anatomy . ^ caused by the upper surface of the cr3^pt of the third molar. Figs. 4 and 5 show the position of the two most frequent ridges orsepta which mark ofl the premolar region in front and the third molarregion behind. It will be seen that they do not run straight across thecavity, but separate obliquely as they approach the outer wall, where theyare much wider apart. The deepest part of the floor of the sinus in normal cases, where no. Fig. 2.—Shows normal condition of maxillary sinus. teeth have been lost, descends about half an inch below the level of thefloor of the infer
. Journal of anatomy . ^ caused by the upper surface of the cr3^pt of the third molar. Figs. 4 and 5 show the position of the two most frequent ridges orsepta which mark ofl the premolar region in front and the third molarregion behind. It will be seen that they do not run straight across thecavity, but separate obliquely as they approach the outer wall, where theyare much wider apart. The deepest part of the floor of the sinus in normal cases, where no. Fig. 2.—Shows normal condition of maxillary sinus. teeth have been lost, descends about half an inch below the level of thefloor of the inferior meatus of the nose (see fig. 2). The septa, to which allusion has alreadj been made, present many pointsof interest. The frequeue}^ of their occurrence surprised me greatly. Out ofthe first forty-five skulls I examined, thirty contained more or less well-developed septa, between a quarter and half an inch in height. They weremuch more frequent on the left side than the right (about in the proportionof 3 to 1). These skulls had no history, but were obviously European. In twenty-six skulls of Negroes from the Congo, varying in age fromfive years to middle age, only two showed septa, and both these were onthe left side. The majority of these septa rise from the floor of the cavity and divide Anatomy and Patliolog}^ of the Maxillary Sinus 359 it imperfectly into compartments, something after the manner of thedivisions of an old-fashioned third-
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
