This video is the second part that extensively outlines the various changes that the embryo undergoes fourth week till the eighth week of development. It focuses more on ectodermal and endodermal differentiation. 00:00 Introduction 01:04 Derivatives of Ectoderm 08:02 Neuroectoderm 22:39 Folding of Embryo 25:50 Yolk Sac 29:16 Differentiation of Endoderm 32:21 Neural Tube Defects