. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. 38 PHYSIOLOGY. Fig. and the reverse obtains where death has occurred during full health. As the rigor mortis comes on the contractility of the muscle departs. Its cause is obscure, and may be complex, but its resemblance to the contraction of fibrine after recent coagulation is strongly marked. The muscular fibres o^ organic life are very different, not only in structure, but also in function, from those already
. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. 38 PHYSIOLOGY. Fig. and the reverse obtains where death has occurred during full health. As the rigor mortis comes on the contractility of the muscle departs. Its cause is obscure, and may be complex, but its resemblance to the contraction of fibrine after recent coagulation is strongly marked. The muscular fibres o^ organic life are very different, not only in structure, but also in function, from those already described. They con- sist of a series of tubes, which are not marked by transverse lines, and in which the longitudinal striae are very faint. These tubes are usually much flattened, and cannot be shown to contain distinct fibrillge. They are generally smaller than those of animal life, and sometimes present markings indica- tive of a granular deposit. The nodosities upon their surface are the nuclei of their original components. (Fig. 10.) The peculiarity of these fibres is, that they are very little subjected to nervous influence, and that when stimulated to contraction by an irritant, they per- form a series of vermicular movements gradually de- creasing in intensity till perfect rest takes place. They are found in the intestinal canal, ducts of glands, middle coat of the arteries and bronchial tubes, &c. In every case muscular action must alternate with intervals of rest. It is in these intervals that the re- paration of the disintegrated tissue takes place, and that the muscle recovers its contractility. The mechanical arrangement of the muscles upon the skeleton is usually accompanied with a loss of power, but with a gain of velocity. The locomotive framework may be regarded as a series of levers, of which the fulcrum is generally a joint. In most cases the muscles are attached near the fulcrum, as in the biceps. By this arrange- ment a contraction of a single inch i
Size: 1111px × 2249px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., booksubjectmateriamedica, booksubjectmedi, booksubjectphysiology
