The two sublayers of the pericardium are the tough outer fibrous pericardium and which more delicate inner layer?

1. The pericardium surrounding the heart consists of two distinct sublayers. 2. The sturdy outer layer is the fibrous pericardium, made of tough, dense connective tissue. 3. The more delicate inner layer is the serous pericardium, itself made of a parietal layer and a visceral layer (the epicardium). 4. The myocardium and endocardium are layers of the heart wall itself, not the pericardium, and mesothelium alone is only the epithelial lining of the serous layer, not the whole inner sublayer. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 19 "The Cardiovascular System: The Heart", section 19.1, p. 828_