85% 8-10% 3-4%

(Image by MIT OCW)

Figure removed due to copyright reasons. Please see:

Moore, Keith L., and T. V. N. Persaud. The Developing Human: Clinically Oriented Embryology

.

Philadelphia, PA: W.B. Saunders Company, 1998. ISBN: 0721669743.

Figure removed due to copyright reasons. Please see: Moore, Keith L., and T. V. N. Persaud. The Developing Human: Clinically Oriented Embryology.Philadelphia, PA: W.B. Saunders Company, 1998. ISBN: 0721669743.