A textbook of obstetrics . , there is usually a lateral inclination of the head sothat the sagittal suture is posterior to the normal position ofthe oblique diameter ^\ the pelvis, and one parietal bone (theanterior) is deeper in the pelvis than the other one. The mechanism of labor in a left occipito-anterior positionof a vertex presentation may be taken as a type o\ the mechanismof all labors, the variations in the process imposed upon it by. Fig. 211.—Vertex presentation, Kit occipitoanterior position. the different positions and presentations of the fetus being readilyunderstood if the typ
A textbook of obstetrics . , there is usually a lateral inclination of the head sothat the sagittal suture is posterior to the normal position ofthe oblique diameter ^\ the pelvis, and one parietal bone (theanterior) is deeper in the pelvis than the other one. The mechanism of labor in a left occipito-anterior positionof a vertex presentation may be taken as a type o\ the mechanismof all labors, the variations in the process imposed upon it by. Fig. 211.—Vertex presentation, Kit occipitoanterior position. the different positions and presentations of the fetus being readilyunderstood if the typical mechanism of the commonest presenta-tion and position is thoroughly mastered. It is convenient to divide the mechanism o\ labor into anumber of steps or acts, as follows : lirst Step.—Accommodation of the size of the fetal skull tothe size of the pelvic canal by llexion ; accommodation of the shape MECHANISM OF PRESENTATIONS AND POSITIONS. 359 . h
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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
