File:Bailey194.jpg

Fig. 194. Diagrams of two stages in the development of the anterior and posterior cardinal veins, the subcardinal veins (revehent veins of the primitive kidney), and the inferior vena cava

The small branches of the cardinals and subcardinals ramify in the primitive kidneys (mesonephroi).

Slightly modified from Hochstetter.

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Reference

Bailey, F.R. and Miller, A.M. (1921). Text-Book of Embryology. New York: William Wood and Co.

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