The Dublin practice of midwifery / By Henry Maunsell.

  • Henry Maunsell
Date:
1834
Catalogue details

Licence: Public Domain Mark

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

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    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 when 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 four inches, which, 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 under the most fa- vourable circumstances. The next in length of the great diameters, is that between the lower part of the forehead and the upper part of the occiput. It usually measures four inches and a half, being about half an inch longer than the last. This comes to be the op- posing diameter in that variety of head present- ation in which the head is extended upon the neck and the forehead applied toward the pubis, called also the fontanelle presentation, in consequence of
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