<P> The fibrous pericardium is the most superficial layer of the pericardium . It is made up of dense and 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 . </P>
inner lining of the fibrous pericardium is formed by
dense and loose connective tissue outer adventitial layer of the neighboring great blood vessels