. Elements of human physiology. Physiology. THE SPINAL CORD 585 simple connective tissue. If however, after the section, the two ends of the nerve have been kept in close apposition by means of sutures, regeneration of the peripheral part of the Fig. // \/- Degeneration and regeneration of nerve-fibres in the rabbit (SchJifer, after Eanvier). A, part of a nerve-fibre in which degeneration has commenced in consequence of the section, fifty hours previously, of the trunk of the nerve higher up; viy, medullary sheath becoming broken up into drops of myelin; p, granular protoplasmic substanc
. Elements of human physiology. Physiology. THE SPINAL CORD 585 simple connective tissue. If however, after the section, the two ends of the nerve have been kept in close apposition by means of sutures, regeneration of the peripheral part of the Fig. // \/- Degeneration and regeneration of nerve-fibres in the rabbit (SchJifer, after Eanvier). A, part of a nerve-fibre in which degeneration has commenced in consequence of the section, fifty hours previously, of the trunk of the nerve higher up; viy, medullary sheath becoming broken up into drops of myelin; p, granular protoplasmic substance which is re- placing the myelin; n, nucleus; g, neurilemma. B, another fibre in which degeneration is proceeding, the nerve having been cut four days previously; p, as before ; cij, axis-cylinder partly broken up, and the pieces inclosed in portions of myelin. C, more advanced stage of degeneration, the medullary sheath having almost disappeared, and being replaced by protoplasm in which, besides drops of myelin, are numerous nuclei which have resulted from the division of the single nucleus of the internode. D, commencing regeneration of a nerve-fibre. Several small fibres, t' t", have sprouted from the somewhat bulbous cut end, b, of the original fibre, t; a, an axis-cylinder â which has not yet acquired its medullary sheath ; s, s', primi- tive sheath of the original fibre. A, C, and D are from osmic preparations; B from an alcohol and carmine 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 Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
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