Normal histology : a manual for students and practitioners / by John R. Wathen.

  • Wathen, John Roach, 1872-
Date:
[1905]
Catalogue details

Licence: In copyright

Credit: Normal histology : a manual for students and practitioners / by John R. Wathen. Source: Wellcome Collection.

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    The fibres, when treated with certain chemicals, may be made to undergo a longitudinal cleavage into fine lihrilhe or sarcostyles^ inMi transversely into disks separating at the mem- branes of Krause. The nltirnate units of which the fibre is composed will thus be*seen to be made up of spindles or double prisms, whose ends become extremely thin and termi- nate in minute spheres. These sj)indles lie parallel and their thickest parts giv^e rise to the dark lines and their thinner ends to the light lines, while the membranes of Krause or the dark Cardiac muscle; a, nucleus of a muscle-cell; h, unmodified cytoplasm ; c, contractile substance with longitudinal and transverse striations ; d, cement-substance uniting contiguous cells ; e, areolar tissue (vessels omitted) between the muscle-fibres formed by union of the individual cells; /, small bloodvessel within the areolar tissue. (Dunham,) lines in the light band are formed by the spherical ends of the spindles. The light line, or median line of llensen, in the dark band is the space between the ])risms or the centre of the spindles. The separate filires are held together by a delicate areolar tissue called the endomymma. These bundles or fasciculi are also surrounded by a similar sheath called i\\Q perimysium, and, lastly, the entire muscle is covered by the epimysium, through which the liloodvessels and nerves penetrate. The cardiac muscle possesses some of the characteristics of