Carnegie Stage 8 |
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| A187 | A187 | N26 | N26 | |||
| 46 XY | 46 XY | 46 XY | 46 XY |
Age is approximately 23 postovulatory days Length is approximately 1 - 1.5mm External Features Include: the appearance of the primitive pit and the notochordal canal. Somites are not yet visible. 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. |