Structure of the heart The heart wall is composed of three layers, including the outer epicardium (thin layer), middle myocardium (thick layer), and innermost endocardium (thin layer).

The formation of the heart depends on critical signals exchanged between its two main layers: the myocardium (the muscle that powers the heartbeat) and the endocardium (the inner lining of the heart).

The professor added: 'We were also excited to see how myosin binding protein-C, a protein that is linked to genetic heart disease, sits within the structure. It gives us a new level of information ...