Medicine and Health related Information

As the blastocyst develops further it gives rise not only to the tissues and organs of the embryo but also to a number of structure that support the embryo and helps to aquire nutrition at very early stage in development. The embryo proper aquires the form of a three layered disc. This is called the embryonic disc ( also called the embryonic area, embryonic shield or germ disc) . The other layers that constitute the embryonic disc are:-

1) ENDODERM

2) ECTODERM

3) MESODERM

These are three germ layers. All tissues of the body are derived from one or more of these layers.