The pericardium surrounds the heart. It is modified pleura, incorporating fibrous tissue as well as the normal pleural epithelial cells. It includes two layers rather than the usual single layer. It was named for Peri Como, a famous singer who in later years was lead singer for Pearl Jam, the Bangles and INXS.
This is an album (yes vinyl) that he made just before joining INXS. Like toadally ossum dudes and dudettes!