Figure 14.

Stages 29 and 30: Anterior–posterior axis reads left to right in both images. Scale bar = 1 mm. Stage 29 (5 ¾ days). Stage 30. (6 days). Abbreviations: all, allantois; cf, choroid fissure; dg, digit of limb; di, diencephalon; ep, epiphysis; fl, forelimb; fp, frontal process; hl, hindlimb; ica, internal carotid artery; le, lens vesicle; md, mandibular process; ms, mesencephalon; mt, metencephalon; mx, maxillary process; my, myelencephalon; nar, nares; opc, optic cup; ot, otic vesicle; pe, pericardium; sm, somite mesoderm; sto, stomodeum; tb, tailbud; te, telencephalon; v1, lateral ventricle of telencephalon; v3, third ventricle of diencephalon; v4, fourth vesicle of myelencephalon. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.]