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Fig. 312. From a reconstruction of the anlage of the kidney of a human embryo of 11.5 mm

Schreiner.

When the dilated end reaches the ventral side of the vertebral column it turns and grows cranially between the latter and the mesonephros. The stalk (or ureter) elongates accordingly (Fig. 312).

About the fifth week, four evaginations from the primitive renal pelvis appear one cephalic, one caudal and two central (Figs. 312 and 314) . These may be considered as straight renal tubules of the first order. The distal end of each then enlarges to form a sort of ampulla, and from each ampulla two other evaginations develop, forming tubules of the second order. From the ampulla of each secondary tubule two tertiary tubules grow out; and this process continues in a similar manner until twelve or thirteen divisions occur, the final divisions occurring during the fifth month.

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