. A text-book of physiology : for medical students and physicians . s convenient to discuss thephenomenon as it occurs in a single fiber. As a matter of fact,each fiber is a complex structure, consisting of several distinctparts. It is developed from a single cell, and since it contains anumber of nuclei, we may regard it histologically as a sort of amultinuclear giant cell of elongated form. Each fiber is enclosedwithin a thin, structureless, elastic membrane, the material of the fiber inside the sarcolemmal bag shows thecharacteristic cross-striation, and is supposed to be of
. A text-book of physiology : for medical students and physicians . s convenient to discuss thephenomenon as it occurs in a single fiber. As a matter of fact,each fiber is a complex structure, consisting of several distinctparts. It is developed from a single cell, and since it contains anumber of nuclei, we may regard it histologically as a sort of amultinuclear giant cell of elongated form. Each fiber is enclosedwithin a thin, structureless, elastic membrane, the material of the fiber inside the sarcolemmal bag shows thecharacteristic cross-striation, and is supposed to be of a semi-liquid or viscous consistency when living. This material, as awhole, is designated as the muscle plasma. There is on record an interesting observation by Kuhne* which seemsto demonstrate the fluid nature of the living muscle substance. He hap-pened, on one occasion, to find a frogs muscle fiber containing a nematodeworm within the sarcolemma. The animal swam readily from one end ofthe fiber to the other, pushing aside the cross bands, which fell into place. 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.)textbookofphysio1916howe
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