Elements of the principles and practice of midwifery . ietal diameter will be transverse, and the occipito-frontal circumference will correspond to the circumference of theinferior strait. The anterior face of the child will be directed tothe anterior part of the uterus, while the bis-acromial diameterwill be placed transversely. As the uterine pains continue, theflexion of the head will be increased, and the occiput forced by VERTEX PRESENTATIONS. 181 degrees to traverse the curve offered by the sacrum, coccyx andperineum, until it finally slips over the posterior commissure. Asthis progress
Elements of the principles and practice of midwifery . ietal diameter will be transverse, and the occipito-frontal circumference will correspond to the circumference of theinferior strait. The anterior face of the child will be directed tothe anterior part of the uterus, while the bis-acromial diameterwill be placed transversely. As the uterine pains continue, theflexion of the head will be increased, and the occiput forced by VERTEX PRESENTATIONS. 181 degrees to traverse the curve offered by the sacrum, coccyx andperineum, until it finally slips over the posterior commissure. Asthis progress of the occiput is being effected, the frontal bone, whichwas originally placed behind the symphysis pubis, rises up, so asto afford more space for the passage of the head. Sometimes,however, the forehead has descended so low, that the eyebrowsmay be felt; this occurrence is very liable to increase the difficul-ties of the delivery. When the occiput has passed the posteriorcommissure, (see fig. 16,) either the occipitofrontal or the occipito- Fig. bregmatic diameters offers to the antero-posterior diameter of theinferior strait; but, as the delivery progresses, the neck becomesfirmly fixed against the perineum, and the force of the pains nowfalls upon the anterior part of the head, and soon effects the pas-sage of the forehead, face and chin. In this case, when the headhas been delivered, restitution takes place, and the face of thechild turns to the left thigh of the mother. The shoulders are now placed transversely, and the left shoul-der, which was originally placed anteriorly, is rotated under the16 182 VERTEX PRESENTATIONS. arch of the pubis, while the right shoulder falls into the hollow ofthe sacrum. The left shoulder first makes its appearance underthe symphysis pubis, but it is the right or posterior shoulder, whichis generally first delivered; the rest of the body is expelled in theusual manner. In this mode of delivery, it sometimes occurs that the occiput iscaug
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