ABSTRACT
Fig. 22-1 Embryonic development of the human face. A, 4-week embryo. B, 5-week embryo. C, 6-week embryo. D, 61∕2-week embryo. e, 7-week embryo. F, 8-week embryo.
FeDCBA
midline.8 n Embryologic: Craniofacial skeleton develops along a helical course symbolized by the letter S
(not commonly used as a classification system).10
