The book A System of Obstetrics : By American Authors V. 1 was written by author Hirst, Barton Cooke, 1861-1935, Ed Here you can read free online of A System of Obstetrics : By American Authors V. 1 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A System of Obstetrics : By American Authors V. 1 a good or bad book?
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If we now make a vertical sec- tion, in the median line, through the sacrum and pubis, we divide the pelvis into two lateral halves, and can notice the peculiarities to which we have already referred. A glance will show that the points of the spines of the ischia are the summits of two inclined surfaces on either side — one surface inclining inward, downward, forward ; the other sur- face inclining inward, downward, and backward. We may now make another section of each lateral half by a cut pas...sing from the points of Vol. I.— 35 546 MECHANISM AND TREATMENT OF LABOR. Fig. 224. the spines of the ischia vertically to the linea ilia, and we shall then have the pelvis divided into four pieces ; and these represent what are commonly called the inclmed planes of the pelvis. The anterior inclined planes, which are the longer and larger, begin at the points of the spines of the ischia, about one inch in front of the sacro-iliac sym- physes, and about the middle of the sacro-sciatic ligament, and, passing obliquely downward and forward, terminate at the anterior edges of the ischio-pubic rami.
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