Tranformations in the Facial Region of the Human Embryo

The human face is invariably interesting, even as an object of embryologic analysis. The early embryonic growth processes are located around the developing sense organs, among which the nose holds a key position. The first indication of the development of the nose is the formation of the placodes, oval areas of thick­ ened and condensed ectoderm, one on each side of the head. Each of these placode...