Operative midwifery : a guide to the difficulties and complications of midwifery practice . quently assumes alateral or biparietal obliquity, and comes to be directed towards oneor other shoulder. As a result of this the sagittal suture, instead ofrunning across the middle of the pelvis, comes to be situated some-times nearer the symphysis, sometimes nearer the the obliquity becomes extremely marked, and then one 34 OPKUATIYK MIDWIFERY speaks of an anterior or posterior parietal presentation (Figs. 17and 18), according as one or other of the parietal bones occupiesthe p
Operative midwifery : a guide to the difficulties and complications of midwifery practice . quently assumes alateral or biparietal obliquity, and comes to be directed towards oneor other shoulder. As a result of this the sagittal suture, instead ofrunning across the middle of the pelvis, comes to be situated some-times nearer the symphysis, sometimes nearer the the obliquity becomes extremely marked, and then one 34 OPKUATIYK MIDWIFERY speaks of an anterior or posterior parietal presentation (Figs. 17and 18), according as one or other of the parietal bones occupiesthe pelvic brim. \>y the older writers such presentations were termed ear presentation-. Prior to rupture of the membranes these presentations mayalternate, but after rupture, as the head becomes fixed, one or otherpersists. Marked examples of the malpositions are rarely encountered whenthe pelvis is of normal size, although, with a pendulous abdomen,before the head is fixed, an anterior parietal presentation often existsif the parturient is standing or lying on her side and the abdominal. 18.—Posterior Parietal Presentation. (After Bamtn.) wall is not supported. The condition therefore is pre-eminently afeature of flat pelvis, and the mechanism of birth is referred to inconnexion with that subject. The variety of obliquity influences greatly the birth, a posteriorparietal presentation being much less favourable than an is especially seen if delivery with forceps is attempted. Withthe anterior parietal presentation traction brings the posterior parietalround the sacral promontory, while with the posterior parietalpresentation the anterior parietal is pulled against the have found the anterior parietal presentation more common thanthe posterior in the slighter degrees of pelvic deformity, and thereverse to be the case where the malformation was very decided. Engagement of the Head in the Transverse Diameter of thePelvis.—Early in labour one frequ
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Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectobstetrics
