| 释义 |
myofibril Anat.|maɪəʊˈfaɪbrɪl|
Also in mod. L. form myofibrilla (pl. -fibrillæ).
[f. myo- + fibril, fibrilla.]
Any of the elongated cylindrical threads, about one micrometre thick, which arranged side by side in a bundle constitute the contractile components of a striated muscle fibre.
1898Jrnl. R. Microsc. Soc. 64 The muscle-cell produces conducting substance (myofibrils). 1913Dorland Med. Dict. (ed. 7) 605/1 Myofibril, myofibrilla, a muscle⁓fibril. 1928Biol. Abstr. II. 804/1 The author compares his results on the origin and formation of myofibrillae in striated muscles with those of other investigators. 1933Physiol. Rev. XIII. 318 Thus far it has been assumed that myofibrils are actual morphologic entities. 1960G. H. Bourne Struct. & Function Muscle I. ii. 34 Hogue (1937) demonstrated cross striated myofibrillae in living cultures of cardiac muscle cells. Microdissection of fresh muscle fibers as a means of demonstrating myofibrils is exceedingly difficult. 1968New Scientist 11 Jan. 70/1 Normal skeletal muscle..is composed of parallel fibres averaging 70 micrometres in diameter. These are in turn made up from hundreds of fine myofibrils, one to two micrometres thick, running the whole length of the fibre. 1970Ambrose & Easty Cell Biol. xi. 370 The myofibril is itself composed of fine filaments.
Hence myoˈfibrillar a.
1927Biol. Abstr. I. 861/1 Cerebellar ataxia [is due] to loss of ‘myofibrillar perceptions’. 1956Anatomical Rec. CXXV. 483 Lacking the regular myofibrillar organization of striated muscles, these filaments appear to span the cell as a loose bundle. 1972D. A. Fischman in G. H. Bourne Structure & Function Muscle (ed. 2) I. iii. 117 Probably no aspect of muscle differentiation has elicited as much interest with biologists as the problem of myofibrillar biosynthesis and assembly. |