The visceral layer is a term used in anatomy to describe a specific layer of tissue that directly covers an organ. It is part of the serous membrane, which consists of two layers: the visceral layer and the parietal layer. The visceral layer is in contact with the organ itself, providing protection and support while allowing for movement. In the case of the heart, the visceral layer is known as the epicardium. Similarly, for the lungs, the visceral layer is referred to as the visceral pleura. These layers help reduce friction between organs and surrounding structures during movement, such as breathing or heartbeats.