. American quarterly of roentgenology . skull should be placed upon the plate. The tube is lo-cated at a distance of twenty-two inches so that the normalcentral ray will pass through the middle of a line drawn fromthe external auditory meatus and directed perpendicularly towardthe plate. When stereoscopic plates are made this same centralposition should be found, and then the tube should be movedone and one-fourth inch anteriorly or posteriorly from this cen-tral point. In the negatives or stereoscopic views one will then see pos-teriorly (1) the external auditory meatus, and anteriorly to thi
. American quarterly of roentgenology . skull should be placed upon the plate. The tube is lo-cated at a distance of twenty-two inches so that the normalcentral ray will pass through the middle of a line drawn fromthe external auditory meatus and directed perpendicularly towardthe plate. When stereoscopic plates are made this same centralposition should be found, and then the tube should be movedone and one-fourth inch anteriorly or posteriorly from this cen-tral point. In the negatives or stereoscopic views one will then see pos-teriorly (1) the external auditory meatus, and anteriorly to this(2)the temporomaxillary articulation; continuing forward fromthis point is (3) the zygomatic arch, and above the zygoma are(4) the sphenoidal sinuses. The sphenoidal sinuses are boundedabove by the sella turcica, below by the zygoma, posteriorly bythe petrous portion of the temporal bone, and anteriorly by theanterior wall of the sinus; anteriorly to the sphenoid one recog-nises (5) the posterior ethmoidal cells; (6) the anterior eth-.
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Keywords: ., bookcentury1900, bookdecade1910, bookidamericanquar, bookyear1912
