Transactions . ascer-tained, but it must have been at least 50 millimeters (2inches). The outer wall is made up of the grooved structureswhich 1 have described above, and of the mcmhrana tym-pani. This latter membrane, which is shown fairly wellin Figs. 2 and 4, is decidedly conical in shape, as seen from. Fig.:5. Viow of the tyiii|)anic cavity from within, showing (distinctly in the photo-jrraph I)ut very faintly in the engraving) the stall-like openings behind and belowthe lloor of the tympanum, a part of the jagged wall surrounding the mouthof the well-like excavation, the two osteophytes a
Transactions . ascer-tained, but it must have been at least 50 millimeters (2inches). The outer wall is made up of the grooved structureswhich 1 have described above, and of the mcmhrana tym-pani. This latter membrane, which is shown fairly wellin Figs. 2 and 4, is decidedly conical in shape, as seen from. Fig.:5. Viow of the tyiii|)anic cavity from within, showing (distinctly in the photo-jrraph I)ut very faintly in the engraving) the stall-like openings behind and belowthe lloor of the tympanum, a part of the jagged wall surrounding the mouthof the well-like excavation, the two osteophytes and the grooved outer wall ofthe passageway leading from the tympanumi to the Eustachian tulic. (Sliglitlyreduced in size.) the side of the tympanum, while the surface of the mem-brane on the side toward the external auditory canal pre-sents scarcel} any hollowing-out at all,—barely enough to The difficulties encountered in photographing the middle ear fromdifterent points of view were found to be very great, and as a consequencethe half-tone pictures which accompanj- this article leave very much to bedesired in the way of clear definition. 582 BUCK. justify the use of the expression, a shallow cone. Thislack of agreement between the two surfaces is due appar-ently to two facts : the marked curvin
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Keywords: ., boo, bookcentury1800, bookdecade1860, booksubjectear, bookyear1868
