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 . r, may be estimated approximatively. It is about•0004 of an inch. This villus presents internally a partition A, dividing its cavity into twovascular tubes. The tubes are situated beside each other, like the barrels of adouble-barreled gun ; they bend toward each other at a, so as to form a singlecanal at the extremity of the villus, which is arterial at D E, but venous at g partition A has only half the th
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 . r, may be estimated approximatively. It is about•0004 of an inch. This villus presents internally a partition A, dividing its cavity into twovascular tubes. The tubes are situated beside each other, like the barrels of adouble-barreled gun ; they bend toward each other at a, so as to form a singlecanal at the extremity of the villus, which is arterial at D E, but venous at g partition A has only half the thickness of the external wall B. It has aspur-like termination at a, and adheres by its base at a to the wall of the villus. When this disposition of the terminal ramifications is once understood, all dis-cussion, as M. Robin remarks, respecting a direct communication between thematernal and foetal vascular systems, is ended. Each of the capillary vessels of this double canal empties into a correspondingone of larger size, at the point of junction or of separation of a ramification witha larger branch; for example (Fig. 56), the arterial tube D E empties at a into . Fig. Tie figure represents a fragment of the villi of the chorion obtained from, the placenta. It exhibitsprolongations of various appearance. Magnified 360 diameters. the trunk of the same nature of the principal branch c v, and the venous tubeg g discharges at the point C. 1 The minute details into which I am about to enter, are the analysis of the researchesof my learned colleague and friend, M. Robin. They are for the most part recorded in anexcellent memoir published by him, and also in the thesis of M. Cayla, one of his pupils. 216 GENERATION. The placenta is therefore composed of two parts, which are very distinct, in aphysiological point of view, although they are confounded in a single mass at theend of gestation. One of these is the foetal portion, and is more especially ad-herent to the chorion, fro
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Keywords: ., boo, bookcentury1800, booksubjectmidwifery, booksubjectobstetrics
