[Formation of the ductal and vascular components of the rabbit kidney countercurrent system]

Series of graphic and plastic reconstructed models, injections of vessels with successive clearing, injections with successive reconstruction and other methods have been performed and applied to study certain peculiarities of anlage and formation, as well as topographic-anatomical interconnections in the canalicular and vascular components in the rabbit counterflow system during prenatal ontogenesis. It has been stated that the conoid fasciculus of the tubular formations (collecting tube, descending and ascending parts of the nephron loop, vessels) is the structural unit in the osmoregulating nephric apparatus; the collecting tube occupies the central position, and loops of three nephrons belonging to the same generations and having connections with the tube are situated, in a definite order, around it.