The early development of man (embryology) is generally taught with the use of embryos of different animals. Human embryos are seldom used. This is true in the medical, graduate and undergraduate curricula. The primary reason for this utilitarian approach is simply because human embryos are generally not obtainable in numbers sufficient for the wide distribution necessary for all colleges and universities. Another reason is that fairly good substitutes are available to exhibit the early embryological stages of development of man. Some of these substitutes are embryos of the chick, frog and pig.
Bartone, J. C.
The Use of Different Embryos in Studying the Development of Man.
Journal of the Minnesota Academy of Science, Vol. 29 No.1, 298-300.
Retrieved from https://digitalcommons.morris.umn.edu/jmas/vol29/iss1/40