FIBRIL

n. Fi'bri2!. L, ,.,fibritta (dim. of fibra, a fibre). Fr., fibrille Ger., Fibrille. Faterchen, Primitivfibrille. It., fibrilla. One of the ultimate, fibre-like divisions composing a fibre or bundle; also any very minute fibre, [a, 17.] Achromatic fs. Fr., fibril les de noyaux, fils achromatiques (ou connect ifs), filaments bipolaires (ou intranucleaires). Ger., Cytop/asn to' (Oder Kerns pin deV, Oder SpindeV) fasern, achromat is che (Oder bla t, Oder intranucleare) Faden, Zellfaden. Syn.: cell-threads, inter stellate lines. F's of achromatic, nuclear, or cell-substance, forming lines which extend from pole to pole in a dividing nucleus, in such a way as to form a spindle-shaped or barrel-shaped figure. The latter incloses partly or wholly the chromatic nuclear f's which are separating to form the daughter nuclei. In the diaster stage these achromatic f's form a kind of bridge between the daughter-nuclei. It has been suggested that the achromatic fs serve as lines along which the chromatic fs travel, and that the poles or ends of the achromatic fs represent the position of the fully developed daughter-nuclei. [Flemming and Str as burger, "Arch. f. mik. Anat.," 1878-1884 (J, 30).]-Chromatic Ts, Chromatin fs. See Nuclear fs. Connective ti ue fs. FT., fibril les du tistm conjonctif. Ger., Bhtdegen-ebsfibrillen. F's which, being collected in bundles, form the fibres or fasciculi of white fibrous connective ti ue. [J. 55, 83.] Elementary fs. See Primitivefs. Inter muscular f*s. Small branches of the intermediate plexus of nerve-fibres in unstriped muscular ti ue which run between the muscle cells. [L, a51.] Intracellular fs. The delicate, thread-like ma es composing the more solid part of the protoplasm of the cell-body. [J, 26, 32.] Intranuclear f. See Nuclear fibril. Moniliform f. See Varicose NERVE-FIBRIL. Nuclear fs, Nucleoplasmlc fs. Fr., bpyaiix(oufilaments) nuclein i ens,reseauxnucleine,reticulumnucleaire(oud ech rom a tine), fibril les nucleaires. Ger., intranucledres Oeriist (oder Netz), KernFdden (-Fasern, -Geriist, oder -Netz). The thread-like fibres consisting of the more solid substance or chromatin in a cell nucleus. According to some authors, they are all connected so that in reality there is nut one long complexly coiled filament. According to others, there are many closely intertwined fs forming a network. There seems to be reason for believing also that the nuclear fs are of two kinds: coarse fs, forming a comparatively wide mesh;work, and very fine fs, forming an exceedingly fine network in the meshes of the coarse network. To distinguish these two forms of nuclear network the term primary nuclear fs is sometimes restricted to the coarse, and secondary nuclear fs to the fine network. [J, 15, 80; " Arch. f. mikr. Anat.." 1878-1884; "Jena. Zeit.," 1884 (J).] Cf. CARYOCINKBIS, Primary FIBRES, and Secondary chromatic FIBRES. Primitive f*s [RUdlnger]. Lat., axis-flbrillce. Fr., flbrillet primitives (ou eUmentaires, ou nervevses). Ger., Axenflbrillcn, Primitirfihrillen. 1. The ultimate or elementary fs of which the axis-cylinder is composed. [J, 26, 80, 31, 35.] 2. Of the older anatomists, an expre ion frequently employed for that which is now only designated as a fibre. [" Anat. u. Phys.," 1849. p. 2<W (J).] Protoplasmic f. A f. or thread of protoplasm. [J-] Ultimate fs. See Primitive fs. [s. 48]