Embryo 31 mm CRL (ca. 8th wk): PIP161189
摘要
Most of the structures described so far do not show any significant changes at this stage of development. The dental primordia, however, have now passed the bud stage and are now—at least in this specimen—in their cap stages (Figs. 16.1, 16.2, 16.3, 16.4, 16.5 and 16.6).