The hydropathic encyclopedia : a system of hydropathy and hygiene in eight parts ..designed as a guide to families and students, and a text-book for physicians . shortening of these muscular fibres, orrather, their alternate contraction and expansion. Muscular contraction is accompanied with the production of sounaand heat; the sound is probably owing to the movement of the adja-cent fibres on each other, and the elevation of temperature is doubtlessto be attributed to those chemical changes by which the disintegrationand renewal of the tissue is effected. Fig. 133. In Fig. 123 are represented
The hydropathic encyclopedia : a system of hydropathy and hygiene in eight parts ..designed as a guide to families and students, and a text-book for physicians . shortening of these muscular fibres, orrather, their alternate contraction and expansion. Muscular contraction is accompanied with the production of sounaand heat; the sound is probably owing to the movement of the adja-cent fibres on each other, and the elevation of temperature is doubtlessto be attributed to those chemical changes by which the disintegrationand renewal of the tissue is effected. Fig. 133. In Fig. 123 are representedfragments of striped element-ary fibres, and showing acleavage in opposite direc-tions. 1. Longitudinal cleav-age. 2. 3, 4. Transversecleavage forming disks. detached di6k, showing theprimitive particles, calledearcous elements. 7, 8. Sep-arated fibrillar, showing thebeaded enlargements. An ordinary muscleconsists of bundles of MAGNIFIED FRAGMENTS OF MUSCULAR FIBRES. „, • , ... fibres, arranged witngreat regularity in the direction of its action. Each individual fibremay be separated into fibrillar by the splitting &f its contents in a longi-. THE TISSUES. 239 tudina direction ; these fibrillae then present a banded appearance,caused by the arrangement of the contents of \he tube. In structure muscular tissue is divided into striated {striped) andnon-striated (unstriped)—the former being mainly appropriated to thevoluntary functions, and the latter to the organic or involuntary. Func-tionally muscles are divided into voluntary and involuntary. The formercontract in obedience to the will, and are the instruments by which themind acts on external objects. Their fibres are arranged in parallellines, and are connected together by areolar substance. Those of in-voluntary motion are more simple in their structure and arrangementthan those under the influence of the will. Their fihres are disposedin layers, generally transverse or diagonal, with distinct parallel linescontin
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