Carnegie Stage 16 Definition

Age is approximately 37 postovulatory days

Length is approximately 8-11 mm

External Features Include: retinal pigment becoming visible externally; the thigh, leg and foot are becoming distinguishable; pharyngeal arch 2 is more massive and more conspicuous (whereas arch 3 is receeding from the surface); auricular hillocks are beginning to appear.


(O'Rahilly R and Muller F [1987] Developmental Stages in Human Embryos. Carnegie Institute, Washington, Publication no. 637)