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A fibril (diminutive of fiber , Latin fibra = fiber) is a microscopic fiber . They are elongated structures that are an essential part of plant cell walls , muscles , nerves and the basic substance of connective tissue . They are made up of polysaccharides (like cellulose ) or proteins (like keratin ).

Fibrils are often grouped into bundles that form larger fiber structures and are in turn composed of microfibrils.



  • Roche Lexikon Medizin , Urban & Fischer, Munich, 5th edition 2003, p. 611. ISBN 9783437151569