Fourteenth-century scientists depicted this ancient observation by drawing the heart as two large contoured cavities connected in a point by a third, smaller cavity, according to Vinken.

February 14, 2017 at 8:02am GMT. Valentine’s Day is dominated by one symbol, and one symbol only: the heart. But it’s not a pumping, accurate scientific drawing we plaster our cards with, so ...

500 Years Later, Scientists Solve Leonardo da Vinci's Human Heart Mystery The inventor sketched intricate muscular structures half a millennium ago. Turns out he was on to something.

“Leonardo da Vinci sketched these intricate muscles inside the heart half a millennium ago, and it is only now that we are beginning to understand how important they are to human health ...