The development of the human body; a manual of human embryology . r). The cross-branch between the two subcardinalspersists, however, and by its connection with the leftcardinal allows the blood from the lower part of that veinto flow over into the vena cava. As the permanent kidneys grow forward (see ) they push their way between the aorta and the poste-rior portions of the cardinal veins, forcing the latter off tothe side and interfering with the flow of blood in them, adifficulty which is overcome by the development of abranch from each cardinal, just above the kidney, whichpasses
The development of the human body; a manual of human embryology . r). The cross-branch between the two subcardinalspersists, however, and by its connection with the leftcardinal allows the blood from the lower part of that veinto flow over into the vena cava. As the permanent kidneys grow forward (see ) they push their way between the aorta and the poste-rior portions of the cardinal veins, forcing the latter off tothe side and interfering with the flow of blood in them, adifficulty which is overcome by the development of abranch from each cardinal, just above the kidney, whichpasses to the medial side of the ureter to unite again withthe cardinal below (Fig. 150, B). As soon as this circle THE VEINS. 28S around the ureter has been established, its lateral limb,which represents part of the original cardinal vein, degen-erates, its anterior portion alone persisting to form a partof the renal vein (compare Figs. 150, A and B, r). Ananastomosis now develops between the right and left car-dinals at the point where the iliac veins open into them.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
