|A transverse section of the thorax, showing the contents of the middle and the posterior mediastinum. The pleural and pericardial cavities are exaggerated since normally there is no space between parietal and visceral pleura and between pericardium and heart.|
The fibrous pericardium is the most superficial layer of the pericardium in the heart. It is made up of dense connective tissue, a loose connective tissue  which acts to protect the heart, anchoring it to the surrounding walls, and preventing it from overfilling with blood. It is continuous with the outer adventitial layer of the neighboring great blood vessels.
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- ^ Tortora, Gerard J., and Nielsen, Mark T. (2009). Principles of Human Anatomy, 11th edition, p.84-85. John Wiley & Sons, Inc. ISBN 978-0-471-78931-4.
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