A theoretical and practical treatise on midwifery : including the diseases of pregnancy and parturition and the attentions required by the child from birth to the period of weaning . ackwards, as the leftoblique, and the one passing from the right towards the left, and from in frontposteriorly, as the right oblique diameter.) The posterior fontanelle is found tothe left and in front, the anterior one is behind and to the right. The dorsalplane of the foetus looks forwards and towards the left side; while its anteriorplane is directed backwards and to the right; the right shoulder is in front a
A theoretical and practical treatise on midwifery : including the diseases of pregnancy and parturition and the attentions required by the child from birth to the period of weaning . ackwards, as the leftoblique, and the one passing from the right towards the left, and from in frontposteriorly, as the right oblique diameter.) The posterior fontanelle is found tothe left and in front, the anterior one is behind and to the right. The dorsalplane of the foetus looks forwards and towards the left side; while its anteriorplane is directed backwards and to the right; the right shoulder is in front andto the right side; the left one is behind and towards the mothers left. Before the bag of waters is ruptured, the childs head is slightly flexed on thefront of the chest, and the following are the relations of its diameter with thoseof the superior strait: the occipito-frontal corresponds to the left oblique of thestrait, and the bi-parietal to the right oblique;1 and, of course, the occipito-frontal 1 We may remark, however, with M. Dubois, that this last relation is not absolutelyexact. For instance, if the head of a foetus at term be found at the superior strait, so that. MECHANISM OF LABOR. 421 circumference of the head is parallel with the periphery of the abdominal strait,and the axis of this strait corresponds with the trachelo-bregmatic diameter1 ofthe head. When the membranes are ruptured, a variable quantity of liquid escapes;then the uterus contracts and applies itself more directly to the foetal trunk;nevertheless,-as but little fluid passes away in vertex positions at this time, thereusually remains a sufficient quantity of it to render the pressure of the uterinewalls on the child far from being immediate. After the rupture, the object of the contractions is to expel it from the womb ;the foetus becomes more curved anteriorly, and its superior and inferior extrem-ities more closely folded up; and, from that moment, properly speaking, themechanical phenomena of l
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Keywords: ., boo, bookcentury1800, booksubjectmidwifery, booksubjectobstetrics
