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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    five inches in breadth, but the effect of their size is counteracted by their possessing capability of motion to such an extent, that one can precede the other in their entry into the pelvis. i From what has been said it is obvious, that the ■ long axes of the head and shoulders decussate, or 1 are at right angles with each other; and we can ‘ now perceive the value of a similar arrangement j which we adverted to before, of the long diameters i of the brim and outlet of the pelvis. At the mo- ! ment when the head is escaping in the most fa- vourable manner through the latter, the shoulders are accommodated in the long diameter of the former. We have next to say a word upon the pelvic extremity of the foetus, as it is packed in the uterus, and sometimes presents in the pelvic pas- sage. Occasionally, the nates form the whole bulk of the presenting part; at other times the feet are assembled with them; and again, the feet or knees pass first into the world. These dif- ferences make a good deal of variation in the antero-posterior diameter of the pelvic extremity, but it is almost always less than the transverse, which pretty constantly measures four inches. Presentation and position,— Before proceeding to the consideration of the mode in which the child is propelled through the pelvis, or, as it is called, the mechanism of parturition, we shall briefly explain the meaning we attacli to two words
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