The practice of obstetrics, designed for the use of students and practitioners of medicine . een in the expansion of the lower uterine segment. While the internalOS and upper cervix and supravaginal portion are dilating, the bag ofwaters begins to bulge through the os, and the fluid pressure can then actdirectly on its edges. This process gradually proceeds till the internal osdisappears, the cervix shortens till it also is abolished, and then the mem-branes act directly on the external os. The force exerted by the membranesis directly proportional to their convexity. This can be explained by
The practice of obstetrics, designed for the use of students and practitioners of medicine . een in the expansion of the lower uterine segment. While the internalOS and upper cervix and supravaginal portion are dilating, the bag ofwaters begins to bulge through the os, and the fluid pressure can then actdirectly on its edges. This process gradually proceeds till the internal osdisappears, the cervix shortens till it also is abolished, and then the mem-branes act directly on the external os. The force exerted by the membranesis directly proportional to their convexity. This can be explained by thelaw in physics that the fluid pressure is opposite and equal in all points, andis exerted at right angles to any surface against which it acts. Consequentlythe rapidity of dilatation will correspond with the degree of bulging of themembranes through the os. After the membranes are ruptured these laws areapplicable to the force exerted by the head in causing dilatation. These facts,together with that of the successively increasing force of uterine contractions, 436 PHYSIOLOGICAL
Size: 1330px × 1879px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectobstetrics, bookyear1
