This video is the first part that extensively outlines the various changes that the embryo undergoes fourth week till the eighth week of development. It focuses more on the mesodermal differentiation that occur during this period. 00:00 Introduction 02:18 Main Events of Fourth Week 02:47 Differentiation of Intraembryonic Mesoderm 06:23 Paraxial Mesoderm, Somite Period & Fate 12:35 Intermediate Mesoderm 13:50 Lateral Plate Mesoderm 15:20 Intraembryonic Coelom 22:24 Somatopleuric Mesoderm 24:55 Splanchnopleuric Mesoderm 28:20 Derivatives of Mesoderm