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.
- Microfibrils in the cell wall of plants
- Myofibrils in muscle cells
- Neurofibrils in nerve cells
- Tonofibrils in epithelial cells
- Collagen fibrils embedded in the cement of the hyaline cartilage
- Chromatin fibrils , condensed chromatin threads
- Macro and microfibrils in the cortical cells of the hair
- Fibrils are sometimes found on the capsid of virus particles (virions), e.g. B. in giant viruses (such as mimivirus , orpheovirus ) and rudiviruses
- Roche Lexikon Medizin , Urban & Fischer, Munich, 5th edition 2003, p. 611. ISBN 9783437151569