Elements of the principles and practice of midwifery . vements of flexion,descent, and rotation, have for their object the constant correspon-dence of the small diameters and circumferences of the childshead, with the large diameters of the pelvis; and the fact that theneck, and not the occiput, becomes fixed against the symphysispubis, gives additional space for the delivery of the forehead, face,and chin, since, if it were not for this arrangement, during thedelivery of these parts, the occipito-frontal and occipito-mentaldiameters would be obliged to pass through the antero-posteriordiamete
Elements of the principles and practice of midwifery . vements of flexion,descent, and rotation, have for their object the constant correspon-dence of the small diameters and circumferences of the childshead, with the large diameters of the pelvis; and the fact that theneck, and not the occiput, becomes fixed against the symphysispubis, gives additional space for the delivery of the forehead, face,and chin, since, if it were not for this arrangement, during thedelivery of these parts, the occipito-frontal and occipito-mentaldiameters would be obliged to pass through the antero-posteriordiameter of the inferior strait. This will be better understood byreference to fig. 12, p. 175, in which the head is represented at theinferior strait, and after rotation has been accomplished. During extension, the chin of the child leaves the breast, theface sweeps over the hollow of the sacrum, and the forehead, face,and chin pass in succession over the posterior commissure of thevulva, and the delivery of the head is accomplished (see fig. 13). Fig. Very shortly after the head is delivered, as has just been described,another movement of the head occurs, which has been termedrestitution. This movement consists in a restoration of the head,after it emerges from the pelvis, to its original oblique position, so 178 VERTEX PRESENTATIONS. that the face of the child, in the mechanism just described, turnstowards the left thigh of the mother (see fig. 14). This restitu-tion was formerly supposed to have been effected entirely at the Fig. 14.
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Keywords: ., boo, bookcentury1800, booksubjectmidwifery, booksubjectobstetrics
