A system of obstetrics . XT OF LABOR. Fig. the -pines of the ischia vertically to the linea ilia, and we shall thenhave the pelvis divided into four pieces; and these represent whatare commonly called the inclined planes of the pelvis. The anteriorinclined planes, which are the longer and larger, begin at the points ofthe 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 ofthe ischio-pnbic rami. The poste-rior inclined planes begin at thepoi
A system of obstetrics . XT OF LABOR. Fig. the -pines of the ischia vertically to the linea ilia, and we shall thenhave the pelvis divided into four pieces; and these represent whatare commonly called the inclined planes of the pelvis. The anteriorinclined planes, which are the longer and larger, begin at the points ofthe 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 ofthe ischio-pnbic rami. The poste-rior inclined planes begin at thepoints of the spines of the ischia,pass downward and backward, andterminate at the middle of the sa-crum and coccyx. The generalshape of the pelvic cavity is ratherthat of a four-sided lozenge thanoval, as is commonly to many authorities,these inclined planes play an im-portant role in the mechanism oflabor. They are supposed to influ-ence the movements of the present-ing part, causing it, when it strikes.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
