Within the chest, a tender shield does lie, A sac that cradles, where the heart does sigh. The pericardium, a guardian so true, Embraces the heart in a loving view.
A double-layered fortress, strong and tight, With fibrous walls, it stands in might. The outer layer, tough, unyielding, bold, Protects the heart from threats untold.
Within, the serous layer, soft and thin, Holds the heart closely, wrapped within. Two layers bound by fluid's grace, Reducing friction, setting a gentle pace.
It anchors the heart with steady hands, Ensuring it remains where it stands. No shift, no sway, can move it far, The pericardium is its guiding star.
And when the blood does surge and flow, It limits the heart, not letting it grow. Preventing strain, it holds the line, Ensuring the beat is pure, divine.
But when it falters, pain may arise, Inflammation brings a bitter surprise. Effusion swells, or thickens tight, Constriction turns day into night.
Yet through it all, this sac of grace, Guards the heart in its tender space. The pericardium, a silent friend, Protects the heart until the end.
