Methyl Green as a Cartilag Setain; Human Embryos

The development of this technique derived from a need to demonstrate the sites of developing cartilage in the human embryo. The basic procedure was that of Yntema (1970), which used methyl green on turtle embryos. However, the thickness of the soft tissues in human embryos of 90-125 mm crown-rump (CR) length and the opacity caused by pigments in this tissue when the specimen was cleared necessitated the modification of the original procedure; specifically, the introduction of bleaching. The altered procedure is given below.