Carnegie Stage 9

This is the appearance of a 3 week old embryo

Human embryonic stage 9 occurs during week 3 between 19 to 21 days. The embryo is now 1.5 to 2.5 mm in size and somites have begun to form and number between 1 to 3 somite pairs during this stage.  (adapted from UNSW Embryology)

Left lateral & dorsal view of model of embryonic body viewed in the plane of section. Yolk-sac, amnion, and body-stalk have been cut away.

Other similar posts
This entry was posted in Embryology and tagged , , , .