. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. Bassin. 185 distorsions affectant l'ensemble du bassin. - Dans ces cas, les os pubiens sont toujours plus ou moins largement impliqués dans la distorsion, et en entrant, comme ils le font, dans la formation des deux bords, l'empreinte, et de sortie, toutes ces parties du bassin sont contractés ou mispropor.- À ras bord, toutefois, l'obstruc- tion prend habituellement place, tandis que les interventions nécessaires pour obtenir la livraison par les passages naturels sont rendus plus difficiles par la déformation de la cavité et de l'ouverture inférieure. Genres

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PELVIS. 185 Distortions affecting the whole pelvis. — In these cases the pubic bones are always more or less extensively implicated in the distortion, and entering, as they do, into the formation of both brim, cavity, and outlet, all these parts of the pelvis are contracted or mispropor- tioned. At the brim, however, the obstruc- tion usually takes place, while the operations necessary to procure delivery through the natural passages are rendered more difficult by the distortion of the cavity and inferior opening. General distortions of the pelvis are com- monly divided into three kinds, named, from the shape of the brim, the ovate or elliptical, — the cordiform or angular, —and the obliquely ovate. The ovate, elliptical, or reniform pelvis. — In this distortion the sacrum is placed almost horizontally, so that the sacral promontory pro- jects forward to a great degree, generally at the same time deviating from the median line, and considerably sunk in a direction forwards and downwards, so that the lowest lumbar vertebra forms the most projecting point. The lateral sacral curve is diminished, flat- tened out, and often bent backwards on each side the promontory. The vertical curvature is generally diminished and flattened in some degree, and directed more downwards by the more horizontal position of the bone; but occasionally there is an acute bend forwards at the lower part. The coccyx is generally bent acutely forwards. The ilia and ischia on each side are often removed to a greater lateral distance than normal. The iliac wings are flattened and directed more forward ; and the cotylo- sacral arch is more sharply curved, and often shorter and thicker than normal. The planes of the ischia diverge instead of slightly con- verging downward ; the spines and tuherosities being likewise divergent, and the latter di- rected more outwards and backwards. The superior rami of the pubes are gene

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