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Day 1: The Journey Begins 3-D Reconstruction of a 24 Hour Chick Embryo 
The image above was made by slicing a fixed 24 hour chick embryo in very thin sections from head to toe. The sections were then photographed under the microscope and brought into a computer. Special software was used to restack the slices into a three-dimensional volume, and even make a 3-D movie! The different layers and organs that are already beginning to develop are colored and labeled.The three basic embryonic germ layers are ectoderm (blue), mesoderm (red) and endoderm (yellow). The purple notochord is the embryonic axis where the spinal column will be. The blue neural tube will become the brain and nervous system. The yellow gut will become the digestive tract, and the red somites will become muscle and skeleton. 3-D reconstruction by Jo Ann Eurell
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