A text-book of the diseases of the ear and adjacent organs . n the Normal and Diseased Con-dition. Stone : London, 1892. OPERATION. 519 medially located mastoid antrum. In this portion limited collections of pus,communicating with the antrmn, occasionally occur, which break throughat the external portion of the posterior wall of the meatus in the region of thesutura mastoideo-squamosa. A sagittal section through the middle of the osseous meatus (Fig. 267) fre-quently touches the lateral border of the mastoid antrum. This lies morelaterally than the tympanic cavity. The mastoid antrum is usuall
A text-book of the diseases of the ear and adjacent organs . n the Normal and Diseased Con-dition. Stone : London, 1892. OPERATION. 519 medially located mastoid antrum. In this portion limited collections of pus,communicating with the antrmn, occasionally occur, which break throughat the external portion of the posterior wall of the meatus in the region of thesutura mastoideo-squamosa. A sagittal section through the middle of the osseous meatus (Fig. 267) fre-quently touches the lateral border of the mastoid antrum. This lies morelaterally than the tympanic cavity. The mastoid antrum is usually larger inthe pneumatic than in the diploetic or compact mastoid process. The lateralportion of the antrum, usually more deeply seated, forms an obtuse angleoutwards with the higher medial portion, which opens into the attic. Forthis reason it is rarely possible to introduce a sound into the tympanic cavityafter opening the lateral portion of the antrum. The lateral part of theantrum lies more behind the middle portion of the posterior wall of the Fig. 266.—Sagittal Saw-cut, 5 mm. medi-ally from the External Opening of theOsseous Meatus on the macerated Tem-poral Bone of an Adult. (Right Side.) v, Anterior lower wall of the osseous meatusbelonging to the pars tymp. ; c, Pneumaticcell-spaces of the middle ear, situated alongthe posterior upper wall of the meatus ; o,Upper edge of the pyramid ; s, Sin. sig-moideus ; st, Proc. styloideus.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecteardiseases, bookyear
