Carnegie Stage 7

Age is approximately 20 postovulatory days

Length is approximately 0.4 mm

External Features Include: the appearence of the notochordal process in the embryonic disc is characteristic of this stage.

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.