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.

    32/328 page 16
    tliis^ it is plain, can meet with no obstruction in passing through any part of the fstaiidard pelvis, the shortest diameter of the latter being nowhere less than four inches. There are, however, three other measurements to be considered, which, from being all in the long axis of the head, are usually called the long diameters. One or other of these, together with the bi-parietal diameter, may be considered as the measure of the bulk of the passing body, in every head presentation. The shortest, and that which is most usually opposed to the long diameters of the pelvis, is described by an imaginary right line, extending from the upper part of the forehead to the lower part of the occiput. This can only become the opposing diameter Avhen the chin is very much depressed toward the chest, as it usually is, the vertex being the presenting part. The length of this line is about fom- inches, wliich, it will be re- membered, is not greater than the shortest dia- meter of the pelvis, but as it is naturally opposed to the longest diameters of that passage, there can, of course, be no want of room in such a case. Such, then, are the relations, as to dimensions, between the head and pelvis imder the most favourable cii-cumstances. The next in length of the great diameters, is that between the lower part of the forehead and
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