The practice of obstetrics, designed for the use of students and practitioners of medicine . re to act as cushions to lessen jars and shocks that mightbe transmitted to the spinal cord, uterus, or fetus, from blows, falls, and trau-matisms in general. The greatest mobility is exerted at the sacro-coccygealjoint, less at the pubic, andleast at the sacro-iliac. Thesacrum can move in anantero-posterior diameter,making a swing of i cm. forthe promontory. This ismost marked when thewoman is on her back withher legs hanging over theedge of the table, the atti-tude known as Walchershanging position.
The practice of obstetrics, designed for the use of students and practitioners of medicine . re to act as cushions to lessen jars and shocks that mightbe transmitted to the spinal cord, uterus, or fetus, from blows, falls, and trau-matisms in general. The greatest mobility is exerted at the sacro-coccygealjoint, less at the pubic, andleast at the sacro-iliac. Thesacrum can move in anantero-posterior diameter,making a swing of i cm. forthe promontory. This ismost marked when thewoman is on her back withher legs hanging over theedge of the table, the atti-tude known as Walchershanging position. (See PartX, Posture in Obstetrics.) Internal Surface of thePelvis.—The bony pelvismay be regarded as a cylin-der, contracted near its mid-dle by the circumference of the pelvic inlet, which divides it into a false pelvis above and a true pelvis contrast to the rough and irregular external surface, the internal surface of thepelvis is smooth and symmetrical, and is clearly divided into the two parts men-tioned above. The cavity of the pelvis may be considered to be an inverted,. Fig. 510.—Anterior Portion of the Internal Sur-face OF the Pelvis. 380 PHYSIOLOGICAL LABOR. truncated cone. The dividing-line consists of the ilio-pectineal line, supple-mented by the superior anterior margin of the sacrum and its alae, or theboundar>^-line is the circumference of the pelvic inlet (Fig. 509). The False Pelvis.—The false, superior, or large pelvis is bounded behindby the last lumbar vertebra and the ilio-lumbar ligaments; on the sides bythe iliac bones; in front there is a gap filled up in the recent state by the elasticlower abdominal wall. If the convergence of the bony walls of the false pelviswere continued downward, they would meet at a point corresponding withthe fourth sacral vertebra. It is from this fact that the false pelvis has oftenbeen compared to a funnel. The false pelvis really belongs to the abdominalcavity, and to its contents it offers protection and s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectobstetrics, bookyear1
