The Dublin practice of midwifery / by Henry Maunsell.

Henry Maunsell

Date:: 1856

Credit: The Dublin practice of midwifery / by Henry Maunsell. Source: Wellcome Collection.

22/328 page 6

$prominence of the psoae muscles and great vessels and nerves. Tlie outlet, or inferior apertm-e, presents in the dry preparation an extremely irregidar figm'e, its margin being interrupted Ijy three deep triangular notches; viz. the t\yo sciatic, and that between the rami of the pubes. In the recent subject, however, the two former are subtended by the sacro-sciatic ligaments, in such a manner as to give the apertm^e a quadrilateral character. Its dimensions are described by two lines : one, pass- ing betfl^een the inner margins of the tubera ischii, and called the transverse diameter, averages in length four inches; the other, denominated the long, or antero-posterior diameter, is stretched be- tween the inferior margin of the symphysis pubis and the tip of the sacrum, and measures five inches. In examining a pelvis, with the coccyx attached, it will be observed that the distance between the same point of the symphysis and the tip of this bone, is not more than fom' inches. Owing, however, to the mobility of the sacro- coccygeal joint, the space admits of being enlarged to five inches, or to the full extent of the distance between the point of the sacrum and the lower margin of the symphysis. In making these measurements it is also to be noted, that the directions of the long and short diameters of the brim and outlet are reversed,—a pro^dsion of$

The Dublin practice of midwifery / by Henry Maunsell.

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