Abstract
Amerini declares that by this book he did not want to make any contribution to the contemporary bioethical debate, or in another way, he wanted to give a preliminary contribution of great importance. His opinion on the implications of Aquinas's embryological theory for today's bioethical debate is in fact that it "certainly has some bioethical consequences, but it does not give rise to one particular bioethical theory rather than another. It is, as said, a philosophical explanation, traced in terms of Aristotelian metaphysics, and as such can only be of support for the elaboration of a bioethical theory".