A text-book of the diseases of the ear and adjacent organs . ic cellular cavities starting from the mastoid antrum extendbackwards to the sutura occipitalis, surrounding the transverse sinus and theemissarium santorin; downwards to the apex and inner surface of the mastoid process; upwards and forwardsto the linea temporalis and the root of thezygomatic process, thereby completelyencircling the auditory meatus, with theexception of the lower anterior wall, andextending inwards frequently to the apexof the pyramid. The cellular cavitiesoften surround the labyrinth on all sides,and directly adjo
A text-book of the diseases of the ear and adjacent organs . ic cellular cavities starting from the mastoid antrum extendbackwards to the sutura occipitalis, surrounding the transverse sinus and theemissarium santorin; downwards to the apex and inner surface of the mastoid process; upwards and forwardsto the linea temporalis and the root of thezygomatic process, thereby completelyencircling the auditory meatus, with theexception of the lower anterior wall, andextending inwards frequently to the apexof the pyramid. The cellular cavitiesoften surround the labyrinth on all sides,and directly adjoin the bulbus venaejugularis and the posterior portion of thecarotid. The diploetic mastoid process shows onsection a marked difference in appearance,consisting, from its apex (Fig. 48, c) to the upper border (6), of small-celleddiploe and osseous tissue, rich in fatty substances, and only occasionally pre-senting air cells in the vicinity of the mastoid antrum, which is, as a rule,small. The sclerosed process is seldom compact, generally containing either. 48 TOPOGRAPHY OF THE MASTOID PROCESS. very close diploetic tissue or large single gaps. The diploetic and scleroticprocesses are on an average smaller than the pneumatic. The third type is represented by the partially diploetic, partially pneumaticform. Here we have numerous varieties, two of which are most frequently
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecteardiseases, bookyear
