In situ morphology of the heart and great vessels in fetal and newborn rats


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ABSTRACT ABSTRACT. Morphology of the cardiac chambers and great vessels of fetal and neonatal rats was studied using the whole body freezing technique and by sectioning through the short


axis of the heart with a freezing microtome. Compared to the fetal heart, the neonatal heart showed rapid change 2 to 8 days after birth. The ventricular sinus septum was straight in the


fetus and became concave to the left ventricle after birth. The right ventricular wall was as thick as the left in the fetus and became thinner rapidly after birth. At the same time, the


right ventricular cavity dilated. The right and left pulmonary arteries and pulmonary veins were small in the fetus and enlarged soon after birth. At the same time, the foramen ovale was


closed and the diameters of the inferior vena cava and descending aorta were diminished. One-half-mm thick sections were cut serially and then photographed. Ventricular volumes and masses


were calculated from summation of the areas of each chambers. Left ventricular mass per body weight increased rapidly after birth, whereas right ventricular mass per body weight remained


constant from 0 to 8 days after birth. SIMILAR CONTENT BEING VIEWED BY OTHERS THREE-DIMENSIONAL ALIGNMENT OF MICROVASCULATURE AND CARDIOMYOCYTES IN THE DEVELOPING VENTRICLE Article Open


access 11 September 2020 A PICTORIAL ACCOUNT OF THE HUMAN EMBRYONIC HEART BETWEEN 3.5 AND 8 WEEKS OF DEVELOPMENT Article Open access 11 March 2022 PSEUDODYNAMIC ANALYSIS OF HEART TUBE


FORMATION IN THE MOUSE REVEALS STRONG REGIONAL VARIABILITY AND EARLY LEFT–RIGHT ASYMMETRY Article Open access 16 May 2022 ARTICLE PDF AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Department


of Pediatric Cardiology, The Heart Institute of Japan, Tokyo Women's Medical College, Tokyo, Japan Kazuo Momma, Atsuyoshi Takao, Ryuichi Ito & Toshio Nishikawa Authors * Kazuo


Momma View author publications You can also search for this author inPubMed Google Scholar * Atsuyoshi Takao View author publications You can also search for this author inPubMed Google


Scholar * Ryuichi Ito View author publications You can also search for this author inPubMed Google Scholar * Toshio Nishikawa View author publications You can also search for this author


inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Momma, K., Takao, A., Ito, R. _et al._ _In Situ_ Morphology of the Heart and


Great Vessels in Fetal and Newborn Rats. _Pediatr Res_ 22, 573–580 (1987). https://doi.org/10.1203/00006450-198711000-00019 Download citation * Received: 16 April 1987 * Accepted: 30 June


1987 * Issue Date: 01 November 1987 * DOI: https://doi.org/10.1203/00006450-198711000-00019 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get


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