. On the theory and practice of midwifery . end Dr. Murphy possesses one of about the same relative proportion of the diameters sometimes varies, so that thebrim may assume an oval shape antero-posteriorly, or a heart shape, andstill all the diameters be excessive. 42. It is evident that a pelvis preternaturally large may be a disadvan-tage to a female who is not pregnant, as it will favour prolapse of thepelvic viscera; and also to one who is pregnant, by more readily permit-ting descents, displacements, &c. Its inconvenience during parturitionconsists in the want of that degree of c
. On the theory and practice of midwifery . end Dr. Murphy possesses one of about the same relative proportion of the diameters sometimes varies, so that thebrim may assume an oval shape antero-posteriorly, or a heart shape, andstill all the diameters be excessive. 42. It is evident that a pelvis preternaturally large may be a disadvan-tage to a female who is not pregnant, as it will favour prolapse of thepelvic viscera; and also to one who is pregnant, by more readily permit-ting descents, displacements, &c. Its inconvenience during parturitionconsists in the want of that degree of contact with the head of the child,necessary to impress upon it the usual partial rotations and changes ofdirection; and the facility with which it would admit of prolapse of thewomb afterwards. E (49) 50 DEFORMITIES. 43. It is more rare to find a pelvis whose size is equably diminished(the pelvis cequabiliter justo minor), without much relative disproportionbetween its diameters, although Naegele and Velpeau think it more com- Fig. mon than writers in general have supposed; and, in support of thisopinion, it may be added, that modern investigations have discovered thatin many, if not most cases of rickets, even where there is no apparentdistortion of the pelvis, there is a certain diminution (one-fourth, I believe)in the aggregate diameters. The obstruction which this deformity offersto delivery is sufficiently obvious. 44. The special distortions of the pelvis are much more frequent. Theyoccur at the brim, in the cavity, or at the lower outlet, but are rarelylimited to one of these situations. The distortion may also occur in anyof the diameters, though the antero-posterior diameter of the brim, andthe transverse of the lower outlet, present them most frequently. Fig. 12.
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