. Lectures on natural and difficult parturition . n of the promontory of the sacrumto one side than the other has been already alluded to. Thecavity of the pelvis, although sufficiently well-formed, oftenvaries very much in shape and depth : it may be round, oval,triangular, deep or shallow, and yet cause little alteration in the 42 LECTURES ON PARTURITION. passage of the head. One variety of this kind, however, de-serves notice, as it forms a pretty accurate contrast to the pelvisresembling the male. It is also funnel-shaped ; but the funnelis reversed. There is rather less space in the brim
. Lectures on natural and difficult parturition . n of the promontory of the sacrumto one side than the other has been already alluded to. Thecavity of the pelvis, although sufficiently well-formed, oftenvaries very much in shape and depth : it may be round, oval,triangular, deep or shallow, and yet cause little alteration in the 42 LECTURES ON PARTURITION. passage of the head. One variety of this kind, however, de-serves notice, as it forms a pretty accurate contrast to the pelvisresembling the male. It is also funnel-shaped ; but the funnelis reversed. There is rather less space in the brim than in thestandard pelvis, it is a little more oval, having its short axis(antero-posterior) less than 4 inches; but the cavity is wider,the planes of the ischia more apart, and the outlet much moreopen than the normal pelvis. It is almost doubtful whether apelvis of this character may not be slightly diseased, and conse-quently that it was beginning to assume something of that shape,the extreme of which forms the distortion of rickets. Fig. Ovate Pelvis of Elizabeth Sherwood. Cordiform Pelvis of Elizabeth Thomson. From these varieties in the healthy pelvis, let me now directyour attention to those which are diseased, and which form thesecond class of exceptions to the standard pelvis. A very greatdifference may be observed in the shapes of the distorted one variety (Fig. 1) you find the brim not only oval, but in-clining to an hour-glass shape by the close approximation of thepromontory of the sacrum to the symphysis pubis : at the sametime the cavity is shallow and open, and the outlet very wide;it is the extreme of the pelvis above alluded to. In another ex-ample (Fig. 2), you find the ilia very upright and almost dou-bled on themselves. The brim is called cordiform, that is, itresembles the ace of hearts, but when the distortion is great, itapproaches much nearer the letter Y. The promontory of thesacrum and the pectineal eminences are quite close, and thebod
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Keywords: ., bookcentury1800, bookdecade1840, bookidlec, booksubjectobstetrics
