. Elements of histology. Histology. chap, ix.] Striped Muscular Tissue. 71 substance, is the material at the expense of which new fibres are formed, or fibres already formed become thickened, as is the case when muscle fibres are kept at constant work. In the muscular fibres of man and most verte- brates (except the fibres of the heart), the muscular corpuscles are situated on the surface of the muscular substance ; but in invertebrates (especially insects and Crustacea) they are often found, in the central part of the fibres, and here they are occasionally seen forming almost a continuous cyl
. Elements of histology. Histology. chap, ix.] Striped Muscular Tissue. 71 substance, is the material at the expense of which new fibres are formed, or fibres already formed become thickened, as is the case when muscle fibres are kept at constant work. In the muscular fibres of man and most verte- brates (except the fibres of the heart), the muscular corpuscles are situated on the surface of the muscular substance ; but in invertebrates (especially insects and Crustacea) they are often found, in the central part of the fibres, and here they are occasionally seen forming almost a continuous cylindrical mass of nu- cleated protoplasmic cells. 89. In the embryo the muscular fibres are de- veloped from spindle-shaped, nucleated cells (Remak, Weissmann, Kolliker). One spindle-shaped cell with an oval nucleus grows rapidly in length and thick- ness, its nucleus divides repeatedly, and the offspring. Fig. 42.—A Striped Muscular Fibre of the Diaphragm of a Guinea-pig. The muscle-corpuscles are much increased in size and numbers; they are probably used here for the new formation of muscular substance. (Atlas.) become shifted from one another as the cell con- tinues to grow in length. The protoplasmic sub- stance all along one side of the cell gives origin to the muscular substance—sarcous elements and lateral disc—while a small rest of protoplasm remains col- lected around the nucleus as the muscle corpuscle. This protoplasm continues to increase in amount,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Klein, E. (Edward), 1844-1925. Philadelphia : H. C. Lea's Son
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