Dr. Conquest's outlines of midwifery : intended as a text-book for students, and a book of reference for junior practitioners.

  • Conquest, Dr.
Date:
1854
Catalogue details

Licence: Public Domain Mark

Credit: Dr. Conquest's outlines of midwifery : intended as a text-book for students, and a book of reference for junior practitioners. Source: Wellcome Collection.

    78/370 (page 64)
    dering intelligible those points which are peculiar to the circulation of the blood in the fojtus.— J. M. W.] During the dilatation of the auricles the blood which has passed through the system of the foetus, and that which has circulated through the placenta, is impelled into the right auricle, fills it, rushes through the fora- men ovale into the left auricle, and there meets with a portion of blood that has circulated through the lungs, and is returned by the pulmonary veins: in this way are both auricles filled, and they contract. During the contraction of the auricles the blood of the right passes into the right ventricle, and the blood of the left into the left ventricle. During the contraction of the ventricles the blood of the right is forced into the pulmonary artery, from which by far the greater part of it passes by the ductus arteriosus into the aorta, whilst a small portion of it is propelled through the lungs to be returned to the heart by the pulmonary veins. The blood of the left is projected into the aorta, and meets with that of the right, which has passed through the pul- monary artery and ductus arteriosus. The aorta and its various ramifications convey it over the whole system, where, having performed its different func- tions, the greater part of it is returned to the heart by the vena cava; but a portion diverges from the general circulating system, and is conveyed in it& deteriorated or venous state to the placenta by the umbilical arteries, to have the requisite changes there