Elements of animal physiology, chiefly human . ubstance of the muscular fibre. The liquid, if squeezed out of thefibre, will coagulate spontaneously; after a time it again liquifies,the body becoming soft and flaccid. If the rigor inortis sets insoon after death, it usually lasts but a short time; if it sets inlate, it usually lasts much longer. 145. Nervous Tissue, or Neurine, comprises two essen-tially distinct kinds of structure, viz. :—the fibrous, andthe ganglionic vesicular or cellular. The former arethe essential components of the nerves, and the interiorof the brain, the latter of the
Elements of animal physiology, chiefly human . ubstance of the muscular fibre. The liquid, if squeezed out of thefibre, will coagulate spontaneously; after a time it again liquifies,the body becoming soft and flaccid. If the rigor inortis sets insoon after death, it usually lasts but a short time; if it sets inlate, it usually lasts much longer. 145. Nervous Tissue, or Neurine, comprises two essen-tially distinct kinds of structure, viz. :—the fibrous, andthe ganglionic vesicular or cellular. The former arethe essential components of the nerves, and the interiorof the brain, the latter of the ganglia and the outerlayer of the brain, and the inner portion of the spinalcord. 146. Primitive Nerve Fibre.—Ordinary nerve fibres ortiibules consist during life of soft, flexible, fragile,transparent, oily-looking, parallel, sub-cylindrical fibres,described as having somewhat the appearance of fine Coagulated Nerve with Sheath and Contentspartially stripped offi Fresh unalteredNerve Fibre. Axis Cylinder. Coagulated Axis \. Stellate Ganglionic Nucleus and NucleolusCorpuscle. Coagulated Sheath andContents. Axis Cylinder, !Fig. 35. Nerve Fibre and Ganglionic Corpuscleglass-tubes filled with oil. During lifi they are per=fectly homogeneous, (See fig, 35.) 72 ANIMAL PHYSIOLOGY. Immediately after death, coagulation of the nerve sub-stance sets in, by which it separates or differentiatesitself into different layers, viz.:—1, An outer structure-less membrane forming a tube; 2, An inner grayish,solid axis-cylinder, which passes up the middle of thetube; 3, A fluid substance in the interspace betweenthe axis-cylinder and the outer tube. These various structures are respectively illustratedin the diagram of nerve fibre. (See fig. 35.) The axis-cylinder of a nerve fibre is rendered very distinct, inthe beautiful microscopic slides sold by the opticians, by immer-sion in ammoniacal solution of carmine, the axis-cylinder becomingdeeply-coloured red by it, while the tub
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