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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    the left acetabulum, and the left when it lies t ward the opposite side. By this oblique positi of the head, its transverse diameter is rendere somewhat less than that which would be describe by a line passing between the two parietal tub rosities, which, if the vertex was the lowest o presenting part, would be the moving transvers diameter. During this stage of the process, th chin of the foetus is depressed upon its chest, s as to bring the shortest of the long diameters o the head, or that between the lower part of th occiput and the upper part of the forehead, int the direction of the oblique or longest diameter of the mother’s pelvis. At this time the greater fontanelle or the vertex is lower than the lesser, and being situated anteriorly, can, from the shal- lowness of that portion of the pelvis, be felt very near the external opening. As the head descends, the face turns somewhat into the hollow of the sacrum, and the vertex approaches the sympli3’^sis pubis. It is, however, the parietal bone which first escapes, and the vertex does not reach the anterior central line until in the very act of being expelled from the outlet. The mechanism by which this turning is accomplished is extremelv interesting. The hollow of the sacrum is pro- vided for the reception of the bulky face of the child, while the convergence of the point of the sacrum and spines of the ischia, and the bevelling of the inner surface of the rami pubis form so
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