. The science and art of midwifery . In. 115. Outline of head after delivery, the browpresenting. 03udin.) iiiiiun. MECHANISM OF LABOR. L95 are increased, while the distance between the chin and a point in thesagittal sntnre anterior to the occiput is diminished. These changesimpart to the head a triangular shape. The peculiar formation is ex-plained by the compression of the occiput between the pelvis and thedorsal surface of the child, and the compensatory elongation whichtakes place in the direction of the forehead. The prognosis is less favorable than in vertex presentations, but isby no m
. The science and art of midwifery . In. 115. Outline of head after delivery, the browpresenting. 03udin.) iiiiiun. MECHANISM OF LABOR. L95 are increased, while the distance between the chin and a point in thesagittal sntnre anterior to the occiput is diminished. These changesimpart to the head a triangular shape. The peculiar formation is ex-plained by the compression of the occiput between the pelvis and thedorsal surface of the child, and the compensatory elongation whichtakes place in the direction of the forehead. The prognosis is less favorable than in vertex presentations, but isby no means so sinister as is popularly supposed. Many cases of origi-. Fig. 116.—Brow presentation, subsequently converted into that of the face.* (Maternity Hospital.) nal brow presentations become converted into face or vertex presenta-tions during the progress of labor; many are delivered spontaneously,or by the aid of the forceps. Craniotomy is rarely called for. Aiilfeld (Die Entstehung Steiss- und Gesichtslagen) furnishes twenty-sixcases in which the result to both mother and child is given. FBIT8CH (Klinikder alltaglichen geburtshulfiicheri Operationen, p. Un gives the histories ofseven cases, and Brorx (Tete du F(etus, p. 53) the history of one case. In thethirty-four deliveries there were two maternal deaths; in one of the fatal casescoxalgic oblique pelvis existed as a complication. In the other the brow spon-taneously changed into a face presentation. There were ten spontaneous deliv-eries, the brow presenting, with four dead children, hut one died previous tolabor. There were ten cases of spontaneous delivery in which the brow duringdeliver
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