The Dublin practice of midwifery / by Henry Maunsell.

  • Henry Maunsell
Date:
1856
Catalogue details

Licence: Public Domain Mark

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

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    allied to our present subject. In describing and measui'ing this canal, three portions are usually specified: the brim, called also the superior strait or introitus; the cavity; and the outlet, or infe- rior strait or detroitus. The Irim formed by the ileo-pectineal lines and the angle of union between the sacrum and lumbar vertebrae is somewhat elliptical in shape, the re- gularity of the figure being interrupted behiad by the projection of the promontoiy or base of the sacrum. The dimensions of this aperture are measured by four lines passing through its centre: the longest of these, passing from side to side, and denomiaated the transverse diameter, is usually about five inches and a quarter in length; the shortest, being that drawn from the centre of the base of the sacrum to the symphysis pubis, and termed the antero-posterior, or conjugate diameter, measures in the standard female pelvis foiu- inches and a quarter. The two remaining lines, called the oblique diameters, are those stretching from the sacro-iliac articulation on one side, to the back of the acetabulum on the other. The length of each of these is commonly, five inches. By many authors the last diameter is mentioned as the longest,—a mistake arising from the circumstance of its actually being so in the recent pelvis j the length of the transverse diameter being then somewhat diminished by the
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