Quantitative study of the heart in human embryo at 17 mm C-R (stade 19).
The heart of 3 human embryos at 17 mm C-R (stade 19) was studied by means of light microscopy and quantitative methods. The serial sections of the embryos were projected for the measurement of the cardiac diameters and cardiac profile areas (point-counting planimetry). The calculated heart volume for each embryo was 7.92; 19.39 and 7.84 mm3 respectively. These data were compared with the data of our precedent works in stages 17 and 18, and can be considered an accessory index for embryonic classification.
Mandarim-de-Lacerda
C A
CA
Department of Human Anatomy, State University of Rio de Janeiro, Brazil.
Sampaio
F J
FJ
D006321:Heart / Q000196:embryology*; D006801:Humans