for this purpose the position of the left and right ventricular outlet including the aortic and pulmonary valve primordia and the left and right ventricle were established with respect to the midsagittal plane of the embryo , using reconstructions of serial sections of chicken ( stage 28-30 ) and rat ( stage 28-30 ) embryos .
C0034086
pulmonary valve
C0225883
right ventricle