Electro-physiology (1896-98) Electro-physiology electrophysiolog01bied Year: 1896-98 ORGANISATION AND STRUCTURE OF MUSCLE 41 transverse bands or stripes to which these give rise in the entire fibre, by a system of letters. The large sections (Q), which appear dark 011 lowering the objective, are divided by the band (h), which is light with the same focus, of varying breadth, and not usually well defined, into three parts—the two ' dark- bands' (Querschichteri), and the less strongly refractive Hensen's stripe (' ETcnsenche ' Mittdsclicibc, Ji), which is not always visible. Schiefferdecker giv
Electro-physiology (1896-98) Electro-physiology electrophysiolog01bied Year: 1896-98 ORGANISATION AND STRUCTURE OF MUSCLE 41 transverse bands or stripes to which these give rise in the entire fibre, by a system of letters. The large sections (Q), which appear dark 011 lowering the objective, are divided by the band (h), which is light with the same focus, of varying breadth, and not usually well defined, into three parts—the two ' dark- bands' (Querschichteri), and the less strongly refractive Hensen's stripe (' ETcnsenche ' Mittdsclicibc, Ji), which is not always visible. Schiefferdecker gives the name of ' middle band' (M. ' Mitt<i- xi-hicht') to a very fine dark line, first accurately described by Hensen, which sometimes appears in the ' middle stripe' (k), but is not always visible. The segments (Q) are generally longer FIG. 27.—Schema of the transverse striation of Beetle-muscle. (Rollett.) in Arthropod muscles than in Vertebrates, so that, with the coincident longitudinal striatiou, the muscle-fibres look as if they were composed of long, dark rows of granules (Fig. 31). The dark band which bisects the clear segment with a low objective (as described by Amici) is known as Dobie's line (Z. Zwisclien- schicht, Engelmann's ' Zwischenscheibe '). Krause described this band as the ' transverse line' and ' basal membrane' of his ' muscle-cases ' (infra). Between (Z) and the two clear segments (./), which in the simplest case (Fig. 27, /) are only sepa- rated by it, two dark bands are occasionally visible ; they are very inconstant in their appearance, and are denoted by Eollett
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