. Lectures on natural and difficult parturition . visions, we would propose to you that of Denman ;it is the most generally adopted, and seems to be that which ismarked out by nature herself. The first stage is dated from the opening of the os uteri to itscomplete dilatation. Denman adds to this definition, the rup-ture of the membranes and the discharge of the liquor , however, renders the division imperfect, because the mem-branes often are not ruptured until late in the second stage, andoccasionally remain unbroken when the head is expelled. Thisaddition is therefore unnecessary,
. Lectures on natural and difficult parturition . visions, we would propose to you that of Denman ;it is the most generally adopted, and seems to be that which ismarked out by nature herself. The first stage is dated from the opening of the os uteri to itscomplete dilatation. Denman adds to this definition, the rup-ture of the membranes and the discharge of the liquor , however, renders the division imperfect, because the mem-branes often are not ruptured until late in the second stage, andoccasionally remain unbroken when the head is expelled. Thisaddition is therefore unnecessary, and causes confusion. 58 LECTURES ON PARTURITION. The second stage commences when the os uteri is perfectly di-lated, and terminates in the expulsion of the child. The third stage is occupied with the expulsion of the placenta. Before describing the manner in which the dilatation of theuterus takes place, it is necessary to recapitulate very briefly thearrangements of the muscular fibres of the uterus, which hasbeen detailed in a former Muscular fibres on the external surface of the uterus, terminating inthe round ligaments a b. The fibres on the external surface form two broad fan-shapedmuscular layers, spreading from the round ligaments over thefundus uteri. On the internal surface, there are three distinctsets of fibres : two of these surround the Fallopian tubes in a con-centric arrangement. The third set pass circularly round thebody of the uterus, and the outer fibres of the two former layersgradually pass into and intermix with those of the latter. Themass of fibres lying between the external and the internal layershave no determinate direction, but may be supposed to give in-creased power to those we have described. Sir C. Bell, in hisvaluable paper On the Muscularity of the Uterus, has men-tioned fibres which pass in a vortiginous direction from thefundus to the mouth of the uterus. Such, then, is the arrange-ment of the muscles or muscle of the uterus, as fa
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Keywords: ., bookcentury1800, bookdecade1840, bookidlec, booksubjectobstetrics
