File:Hand-book of physiology (1892) (14761983611).jpg

Identifier: handbookofphysio00bake (find matches)
Title: Hand-book of physiology
Year: 1892 (1890s)
Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed
Subjects: Physiology Human physiology
Publisher: London : John Murray
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Fig. 85.—Part of a striped muscle-fibre of a water beetle prepared with absolute alcohol.A, sarcolemma; B, Krauses membrane. The sarcolemma shows regular bulgings.Above and below Krauses membrane are seen the transparent lateral discs. Thechief mass of a muscular compartment is occupied by the contractile disc composed ofsarcous elements. The substance of the individual sareous elements has collected moreat the extremity than in the centre : hence this latter is more transparent. Th« opticaleffect of this is that the contractile disc appears to possess a mediandisc (Disc ofHensen). Several nuclei of muscle corpuscles, C and D, are shown, and in them aminute network, x 300. (Klein and Noble Smith.) this way best demonstrated. The fibres are of a pale yellow colour,and apparently marked by fine striae which pass transversely round
Text Appearing After Image:
Fig. 86.—A. Portion of a medium-sized human muscular fibre, x 800. B. Separatedbundles of fibrils equally magnified ; a, a, larger, and b, b, smaller collections; c, stillsmaller; d, d, the smallest which could be detached, possibly representing a singleseries of sarcous element. (Sharpey.) CH. in.) THEORIES AS TO MUSCLE STRUCTURE. 89 them, in slightly curved or wholly parallel lines. The sarcolemmais a transparent structureless elastic sheath of great resistancewhich surrounds each fibre (fig. 84). There is still some doubtregarding the nature of the fibrils. A striated muscle fibre, when examined with a sufficiently highpower of the microscope, presents the following appearances,longitudinally:— (a.) Alternate, dark and light parallel transverse stripes, towhich this variety of muscle owes its name, the depth of thestripes not always being the same. (b.) With still higher powers of the microscope, the brightstripes may be seen to be divided in the middle line by othervery fine t

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