. An American text-book of obstetrics. For practitioners and students. ess than in the inter-vening space, called the excavation. An accurate knowledge of this por-tion of the parturient canal is of the greatest importance, and on account ofits complexity is most easily given by separate descriptions of the excavationand of each of the straits, after which description it will be easy to includethat of the pelvis as a whole in the general description of the parturient canalthat follows at the end of this section. TJie superior strait is bounded by the promontory and the anterior surfaceof the f
. An American text-book of obstetrics. For practitioners and students. ess than in the inter-vening space, called the excavation. An accurate knowledge of this por-tion of the parturient canal is of the greatest importance, and on account ofits complexity is most easily given by separate descriptions of the excavationand of each of the straits, after which description it will be easy to includethat of the pelvis as a whole in the general description of the parturient canalthat follows at the end of this section. TJie superior strait is bounded by the promontory and the anterior surfaceof the first sacral vertebra, the linea terminalis, and the pubic crests. Theshape of the inlet or superior strait of the pelvis varies considerably in accord-ance with the point of view selected, but if the eye of the observer is placedin the probable position of the axis of the child at term, it will be seen thatthe shape of the inlet is approximately circular (Fig. 212). THE MECHANISM OF LABOR. 391 It must be remembered that the presence of the soft parts somewhat alters. Fig. view of the pelvis, showing superior and inferior straits (one-third natural size). the shape of the brim. The importance of this fact, however, is lessened by
Size: 1566px × 1596px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
