FIBROUS PERICARDIUM Meaning and
Definition
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The fibrous pericardium is a protective and connective tissue structure that encloses the heart and anchors it within the chest cavity. It consists of a tough, dense, and fibrous outer layer composed mainly of collagen fibers, hence the term "fibrous" in its name.
This pericardial layer is located on the outside of the heart's serous pericardium, which is a thin, lubricated, double-layered membrane that directly covers the heart. The fibrous pericardium acts as a supportive, non-elastic sac that helps maintain the heart's position and protects it from external forces, thereby preventing excessive movement and potential damage.
The collagen fibers of the fibrous pericardium provide strength and resiliency to this structure. They contribute to the rigid nature of the pericardium, preventing the heart from expanding too much during normal functioning and maintaining its shape. Additionally, the fibrous pericardium has attachments to the diaphragm and the sternum, helping to anchor the heart in place and restrict its movement.
The fibrous pericardium also serves as a barrier against infection and inflammation from adjacent structures in the chest. Its dense composition provides a mechanical barrier that helps shield the heart from potentially harmful external influences.
Overall, the fibrous pericardium is an essential component of the pericardial sac, providing structural support, protection, and stabilization to the heart.
Etymology of FIBROUS PERICARDIUM
The word "fibrous" in the term "fibrous pericardium" comes from the Latin word "fibra" meaning "fiber" or "thread". It refers to the dense and tough nature of the pericardium, which is composed of fibrous connective tissue.
The term "pericardium" also has a Latin origin. It is derived from the Latin words "peri-" meaning "around" and "cardium" meaning "heart". Hence, "pericardium" translates to "around the heart" and describes the double-layered sac that surrounds and protects the heart.
