This is a plastinated black bear heart that has the pericardium still attached. The pericardium is a tissue sack that surrounds the heart and helps keep the heart in place and cushion it from mechanical stress. The heart has been cut to highlight the 4-valve view from a superior angle. The model uses reference ID: Ursine0002.
To learn more about cardiac anatomy, visit the [Atlas of Human Cardiac Anatomy](http://www.vhlab.umn.edu/atlas/).