Leonardo Da Vinci drew this heart structure 500 years ago: Scientists may have just solved the mystery that may predict heart disease

Leonardo da Vinci was sketching the human body long before modern medicine even existed. One of his more curious drawings focused on the inside of the human heart, something most people barely understood back then. Reports suggest the 500-year-old structure has long puzzled scientists, but they now think they understand what Da Vinci was looking at. It is a strange mesh-like structure inside the heart called the trabeculae, which appears in complex branching patterns across the ventricular walls.For centuries, it sat there in textbooks and scans, noticed but not really understood. Experts say it might even play a role in the risk of heart disease. Sounds a bit dramatic, but the science behind it is surprisingly solid, tied to genetics, MRI scans, and large-scale data from thousands of people. Still, not everything is fully clear yet. Some pieces of the puzzle are missing, especially regarding how its structure changes over time and affects heart efficiency.Da Vinci wasn’t guessing blindly. He dissected human bodies himself, which was rare and a bit controversial in his time. In his drawings of the heart, he noticed these branching, almost tree-like patterns inside the chambers. He thought they might warm the blood. Like a kind of natural heating system. A creative idea. Not quite right, experts say, but not completely off in spirit either. For hundreds of years, these structures didn’t get much attention. They were visible in anatomy, sure, but mostly brushed aside as just internal texture. According to the study published in Nature, titled, ‘Genetic and functional insights into the fractal structure of the heart’, these structures are called trabeculae. They form a kind of spongy, uneven lining inside the heart’s ventricles. More like tangled muscle strands that seem they aren’t just leftover biological noise from development. Researchers now think they might actually affect how blood flows and how efficiently the heart pumps. Some shapes appear to be linked with better heart performance. Scientists used MRI scans from large population studies, including data from tens of thousands of people. One of the biggest sources was the UK Biobank. Some trabecular patterns seemed to correlate with a higher risk of cardiovascular disease. Nothing absolute, nothing final, but enough to raise eyebrows. It wasn’t just imagining either. Computer simulations helped model blood flow through these structures. The results hinted that the internal “texture” of the heart might influence performance more than previously thought.Then came the genetic side of things. Researchers reportedly identified multiple genetic locations linked to how these trabeculae form. So it’s not random. It’s coded and built into biology from early development. The structure itself follows something called fractal patterns. That just means it branches in repeating, self-similar ways. Like trees, rivers and even lightning. Experts say this kind of structure shows up in nature when systems need efficiency in a limited space. The heart seems to follow that same logic.There’s something a bit strange about it. A Renaissance artist sketching a structure that modern genetics and imaging are only now explaining. Da Vinci didn’t have MRI machines or genomic maps but only observation. He might not have been right about function, but he definitely saw something real. Not everything is solved. Some links between trabeculae shape and disease are still being tested. But the direction is clearer than it was even a decade ago.