Identifier: americanquarterl04amer (find matches)
Title: American quarterly of roentgenology
Year: 1912 (1910s)
Authors: American Roentgen Ray Society
Subjects: Nuclear Medicine Radiography Radiology Radiology
Publisher: Pittsburgh : American Roentgen Ray Society
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and the National Endowment for the Humanities

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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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<u o j r-; ^ J-H a; •- -^ -^^ O <V C/5 •— -j_) O •- u > O <u 3 oo t:; biO C ^ ^ O -9 o ^ -^ ojoji: -i-j -- P^ 0) c.ii 1 ^ ^ 1 ^ <v -C CO O C .^li ^ — T^ bo c ^ »-^ c« .5 ^ ^3 -a 3 rrt C r; (U c/) ^.Tn r I Pfahler: Sphenoid Sinus Disease. 61 moidal cells, and above and anteriorly to these cells (7) thefrontal sinuses; through the ethmoidal cells can be traced theoutline of (8) the orbit, and below the orbit (9) the maxillarysinus- The Antero-posterior View is used in exceptional instances—when on account of the physical or mental condition the patientis neither able to sit up or lie upon the face, such as wouldoccur in fracture of the base of the skull, abscess of the brainor marked dyspnoea. This position has been recommended byMarseblick and Schuller. The patient is placed upon his back,with his occiput upon the plate. The tube is then centered overthe base of the nose. This will project the transparent areasof the sphenoid through

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