What’s in Leonardo da Vinci’s notebooks?

Leonardo chronicles the study of human anatomy through drawings and accompanying notes, revealing details that have never been described before, of which two cases are particularly noteworthy, the first being an elderly man with atherosclerosis and clogged arteries.

This was the diagnosis of heart disease hundreds of years before doctors recognized the symptom.

At the same time, Leonardo conducted an autopsy of a child and found that the same type of blood vessel was not blocked.

In Leonardo’s drawings, he also found a way to express features from 8 angles, in a cross section, and many cutting drawings that help to peel apart many layers of muscle and tissue, revealing each layer of structure.