. The Canadian journal of medicine and surgery . e most important boundary,corresponds to the outer wall of the middle and inferior nasalmeati. This wall is divided into two portions by the attach-ment of the inferior turbinal bone, the superior portion corre-sponding to the outer wall of the middle meatus and leavingin its upper and back part an opening, the natural ostium, whilethe lower part is in relation to the outer wall of the inferiormeatus and is marked by a slight ridge showing the situationof the lower end of the lacrymo-nasal duct. The upper por-tion is thin and composed of both bo
. The Canadian journal of medicine and surgery . e most important boundary,corresponds to the outer wall of the middle and inferior nasalmeati. This wall is divided into two portions by the attach-ment of the inferior turbinal bone, the superior portion corre-sponding to the outer wall of the middle meatus and leavingin its upper and back part an opening, the natural ostium, whilethe lower part is in relation to the outer wall of the inferiormeatus and is marked by a slight ridge showing the situationof the lower end of the lacrymo-nasal duct. The upper por-tion is thin and composed of both bone and mendirane, but thelower part is made up of bone of varying thickness, but thinnestimmediately below the point where the turbinal flange ends. From this it will be noted that we have a secreting mem-brane in a large cavity, the floor of which is generally lowerthan the floor of the nose, and which has its natural ostiumnear the roof. It is not surprising, tben, that once infection 406 Canadian Joanial of Medicine and ^ar(jerij. Dec., 1019. Plate I. Dissection showing the right maxillary sinus opened upon its outer ostium maxillare is seen situated immediatelj below the roof of thecavity. The outer table of bone is removed in order to show the relationof the fanss of the teeth to the floor of the antrum. Anterior ethmoidalcells are seen passing into the roof of the orbit behind the frontal sinus. —Logan Turner. takes place in the antruiii there is little chance of its termin-ating without the formation of considerable exudation. A further study of the region of the natural ostium fromthe nasal side aids us in comprehending how easily the intricatedrainage system may be completely disorganized. The unci- Dec, 1910 Cfniddidii Journal of Medicine and Surgery. 40T form groove may no longer resemble a gutter, if in the presenceof a chronically inflamed nasal mucous memhrane there isalso a prominent bulla and an hypertrophied lip of the uncinateprocess. If to this i
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