From Big Medical Encyclopedia

FIBRYLLY (Latin fibrilla a fibril) — the general name of threadlike structures in cells and tissues of animals and plants.

Conditionally to F. carry structures, distinguishable in a light microscope; thicker educations consisting F of bunches., visible with the naked eye or iod a magnifying glass, more often call fibers (fibrae). The thinnest threads revealed at electronic microscopic examination, free or being a part F., call protofibrils, microfibrils, filaments, protofilaments or microfilaments. E.g., the cross-striped muscle fiber having diameter of 10 — 100 microns contains the myofibrils (their diameter apprx. 1 micron) developing, in turn, from thick (to dia. 10 — 16 nanometers) and thin (to dia. 5 — 8 nanometers) myofilaments; nervous cells and fibers contain the neurofibrilla (see Fi rillo very tectonics) consisting of neurofilaments (to dia.

8 — 10 nanometers) and neurotubules (to dia.

20 — 26 nanometers). Nitevidnost F., as a rule, is defined by a fibrillar structure of the macromolecules forming them.

T. different fabric elements are various by origin, to a structure, the sizes and functional value. E.g., epithelial cells produce tonofibrils and various cytoplasmatic microfibrils; derivatives of connective tissue cells (see) are collagenic, elastic also others F.

See also Cell, Cytoplasm.

Bibliography: Histology, under the editorship of V. G. Yeliseyev, etc., M., 1983; D e Rob er-yew E., Novinsky D. and With and e with F. Cytobiology, the lane with English, page 34, M., 1973; M e c of l of e r D. Biokhimiya, ler. with English, t. 1 — 3, M., 1980;

Whyte A. and d river. Fundamentals of biochemistry, t. 1, page 100, M., 1981; Ham A. and To about r-m and to D. Gistologiya, the lane with English, t. 1, page 226, M., 1982. Ya. E. Hesinonim