Galen never dissected a human body — his knowledge about human anatomy came mainly from investigations of the Barbary ape. Galen's predecessors had found empty arteries and an empty left side of ...

As Leonardo's fascination grew, he would delve deeper into anatomy as a discipline. This traces back to the 2nd-century Greek ...

Vesalius noticed that Galen had made some incorrect assumptions about the human body, as Galen had been unable to dissect human corpses. Galen had based his ideas about the human body on his ...