. A text-book of physiology : for medical students and physicians . Fig. 1.—A cross-section of musclefiber of rabbit. The bundles of fibrils aredark; the intervening small amount ofsarcoplasm is represented by the clearspaces.—(Kolliker.). Fig. 2.—Cross-section of two musclefibers of the fly: Ms, The columns offibrils; Sp, the sarcoplasm.—(Schieffer-decker.) again after the animal had passed. At one end, where the fiber had beeninjured, the worm was unable to force its way. The muscle substance atthis point was dead and apparently had passed into a solid condition. Thefact that the cross bands
. A text-book of physiology : for medical students and physicians . Fig. 1.—A cross-section of musclefiber of rabbit. The bundles of fibrils aredark; the intervening small amount ofsarcoplasm is represented by the clearspaces.—(Kolliker.). Fig. 2.—Cross-section of two musclefibers of the fly: Ms, The columns offibrils; Sp, the sarcoplasm.—(Schieffer-decker.) again after the animal had passed. At one end, where the fiber had beeninjured, the worm was unable to force its way. The muscle substance atthis point was dead and apparently had passed into a solid condition. Thefact that the cross bands were displaced only temporarily by the movementand fell back into their normal position would indicate that they may havea more solid structure. * Kuhne, Archiv fur pathologische Anatomie, 26, 222, 1863. THE PHENOMENON OF CONTRACTION. 19 Disregarding the nuclei, the muscle plasma consists of twodifferent structures: the fibrils, which are long and thread-like andrun the length of the fiber, and the inter-vening sarcoplasm. The fibrils consist ofalternating dim and light discs or segments,which, falling together in the different fibrils,give the cross-striation that is character-istic. In mammalian muscles the fibrils aregroupe
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