. The science and art of midwifery. ndus to the cervix,has been sometimes assumed for the human subject. The peristalticwave, however, if, indeed, it exists, extends so rapidly that it is bestto consider the uterus as a hollow muscle, which contracts simulta-neously in all its parts. As labor advances, an increase in the lengthand the force of the contractions is developed. The stronger thepains, the shorter is the interval between them. The average normalduration of a labor-pain is about one minute. The Action of Labor-Pains upon the Uterine Walls.—During theintervals between the pains, it is
. The science and art of midwifery. ndus to the cervix,has been sometimes assumed for the human subject. The peristalticwave, however, if, indeed, it exists, extends so rapidly that it is bestto consider the uterus as a hollow muscle, which contracts simulta-neously in all its parts. As labor advances, an increase in the lengthand the force of the contractions is developed. The stronger thepains, the shorter is the interval between them. The average normalduration of a labor-pain is about one minute. The Action of Labor-Pains upon the Uterine Walls.—During theintervals between the pains, it is well known that the uterus possessesan ovoid shape, and is flattened antero-posteriorly by the pressure ofthe abdominal walls. During the pains, however, the uterus, as it THE PHYSIOLOGY OF LABOR AND ITS CLINICAL PHENOMENA. 135 closes upon the fluid contents of the ovum, assumes a more nearlyglobular outline. As a consequence, the transverse diameter is dimin-ished, and the antero-posterior increased in corresponding Fig. 77.—Transverse section, dotted linerepresenting shape of uterus duringa pain. (Lahs.)
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Keywords: ., bookcentury1800, bookdecade1890, bookidsci, booksubjectobstetrics
