Carnegie Stage 9 |
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| N17 | N17 | N17 | N509 | |||
| 46 XY | 46 XY | 46 XY | 46 XY |
Age is approximately 26 postovulatory days Length is approximately 1.4 - 2.5mm External Features Include: the head fold is present. Neural folds may be apposed but are not yet fused at any point. No visible pharyngeal arch. O'Rahilly R and Muller F [1987] Developmental Stages in Human Embryos. Carnegie Institute, Washington, Publication no. 637, and O'Rahilly R, Müller F (2010) Developmental stages in human embryos: revised and new measurements. Cells Tissues Organs. 192:73-84. PMID: 20185898. |