Taking apart
Vesalius
Vesalius revolutionised anatomy. Dissecting in person, inventing or borrowing new instruments at need, he inventing much of the technique (for instance, the mounting of skeletons) which is still used.  The feature of his book De Fabrica Corporis was its wonderful illustrations. In the Middle Ages there had arisen a tradition of manuscript anatomical sheets. These were what we should call mere diagrams, the body being shown in a squatting posture with indications of the correspondence of the parts of this " microcosm " with those of the " macrocosm " (the universe). Bones, muscles, arteries, veins, nerves, and sometimes reproductive organs, were put on separate diagrams. They were grossly inaccurate, but the point here is rather that they were diagrams, not naturalistic plates. These latter were the innovation of Vesalius in anatomy and of the " German fathers " in botany. It was an essential advance, but it must be noted that it was only a preparatory one. At the present time, both kinds of illustration are used, diagrams having returned for many purposes.
In the illustrations drawn for Vesalius there is no lack of life ; but this is itself due to a touch of the abstract—to the vivid sense of the body as a living, functioning whole which is impressed on them.  This Renaissance perception was not far from the modern ideas of organism. It was also beginning to be develop to two related ones : the growth of the individual —embryology— and the comparison of man with other animals—comparative anatomy.