This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Gray. en Series of transverse sections through the embryonic disk of Tarsius After Hubrecht Section passes through the disk in front of Hensen knot and shows only the ectoderm and entoderm Sections II III and IV pass through Hensen knot which is seen in tapering away into the primitive streak In III IV and the mesoderm is seen springing