Fibrous ring --> fibrous ring of heart
One of four fibrous rings that surround atrioventricular and arterial orifices of the heart, providing attachment for the valve leaflets and maintaining patency of the orifice. As part of the fibrous skeleton of the heart, the fibrous rings also provide origin and insertion for the myocardium.
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... into human tissue to take up residence in the body. (Regular laundering with hot water and detergent apparently do nothing to kill the organism ... natural - likely cotton or paper and some wool. Also present within the fibrous matrix were occasional fungal spores. These spores are typical of ...
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