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intrafusal
intrafusal adj.
Brit. 
/ˌɪntrəˈfjuːzl/
, /ˌɪntrəˈfjuːzl/U.S. /ˌɪntrəˈfjuz(ə)l/
[Latin fusus spindle] situated or occurring within a muscle spindle./ˌɪntrəˈfjuz(ə)l/ΘΚΠ
the world > life > the body > structural parts > muscle > parts of muscle > [adjective]
myomeric1889
sclerotomic1890
myotomic1893
intrafusal1894
myotomal1931
triadic1957
sclerotomal1971
1894 C. S. Sherrington in Jrnl. Physiol. 17 240 Its own contained muscle-fibres, or as they may be termed the intrafusal muscle-fibres, always however run parallel with the long axis of the spindle itself.
1905 J. S. Ferguson Normal Histol. ix. 136 The bundle of intrafusal muscle fibres is again surrounded by a delicate axial sheath of connective tissue.
1968 R. Passmore & J. S. Robson Compan. Med. Stud. I. xxiv. 12/2 A muscle spindle..contains a few short and very slender striated muscle cells; these are the intrafusal fibres which contrast with the main mass of extrafusal fibres. The intrafusal fibres receive motor nerve terminals.
1970 F. J. Schulte in U. Stave Physiol. Prenatal Period II. xxv. 805 In kittens, the intrafusal activity..seems to be less tonic than in adult cats.
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