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. 2013 Jun 27;274(10):1090–1110. doi: 10.1002/jmor.20165

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© 2013 The Authors. Journal of Morphology Published by Wiley Periodicals, Inc.

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Stages 11 and 12: Anterior–posterior axis reads left to right in both images. Scale bar = 1 mm. Stage 11 (2 ¼ days). Stage 12 (2 ⅓ days). Abbreviations: anp, anterior neural pore; ap, area pellucida; bc, bulbus cordis; bi, blood islands; di, diencephalon; fb, forebrain; fgl, foregut lumen; hb, hindbrain; hg, hindgut lumen; hn, Hensen’s node; lbf, lateral body fold mesoderm; mb, midbrain; mm, mesomere; ms, mesencephalon; mt, metencephalon; my, myelencephalon; nf, neural fold; nh, rhombomeres of hindbrain; no, notochord; npm, nephrogenic mesoderm; nt, neural tube; onp, open neural plate; op, optic vesicle; po, proamnion; ps, primitive streak; si, sinus terminalis; sm, somite mesoderm; tb, tailbud; te, telencephalon; tf, tail fold; usm, unsegmented somite mesoderm; v, ventricle of heart; vas, area vasculosa; vv, vitelline vein.