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Cardiac skeleton
The cardiac skeleton, also known as the fibrous skeleton of the heart, is a high density single structure of connective tissue that forms and anchors the valves and influences the forces exerted through them. The cardiac skeleton separates and partitions the atria (the smaller, upper two chambers) from the ventricles (the larger, lower two chambers). This is important because it forms the primary channel that electrical energy follows from the top to the bottom of the heart.
==Structure==
The cardiac skeleton consists of four bands of dense connective tissue, as collagen, that encircle the bases of the pulmonary trunk, aorta, and heart valves.〔''Martini Anatomy and Physiology, 5th ed.''
〕 While not a "true" skeleton, it does provide structure and support for the heart, as well as isolating the atria from the ventricles. In youth, this collagen structure is free of calcium adhesions and is quite flexible. With aging some calcium can accumulate on this skeleton. This accumulation contributes to the delay of the depolarisation wave in geriatric patients that can take place from the AV node and the bundle of His.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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