Elements of histology (1898) Elements of histology elementsofhistol00klei Year: 1898 186 Elements of Histology lining the central canal : some show in i:)reparations stained after Golgis method processes of extreme length (Fig. 131). (<?) Another considerable accumulation of neuroglia exists near the dorsal end of the posterior grey horns, as the suh-^tnntia gdotinos<i of Rolando. 173. The white uiatter (Fig. 132) is composed, besides neuroglia, of medullated nerve fibres varving veiy much in diameter, and forming the essential and chief part of it. They possess an axis cy- linder an
Elements of histology (1898) Elements of histology elementsofhistol00klei Year: 1898 186 Elements of Histology lining the central canal : some show in i:)reparations stained after Golgis method processes of extreme length (Fig. 131). (<?) Another considerable accumulation of neuroglia exists near the dorsal end of the posterior grey horns, as the suh-^tnntia gdotinos<i of Rolando. 173. The white uiatter (Fig. 132) is composed, besides neuroglia, of medullated nerve fibres varving veiy much in diameter, and forming the essential and chief part of it. They possess an axis cy- linder and a thick medullary sheath more or less lamin- ated, but are devoid of a neurilemma and its corpuscles. Of course, no nodes of Ranvier are observ- able. In specimens of white matter of the posterior co- lumns, Avhere the nerve fibres have . been isolated by teas- ing after hardening, many fine'medullated libres are met with which show the varicose appearance mentioned in a former chapter. The medullated nerve fibres, or rather the matrix of their medullary sheath, con- tains neurokeratin. The nerve fibres of the white matter run chiefly in a longitudinal direction, and they are separated from one another by the neuroglia. Here and there in the columns of white matter are seen connective-tissue septa with vessels, by which the nerve fibres are grouped more or less distinctly in divisions. 174. Although most of tiie nerve libres con- Fig. 132.—From a transverse section through the White Matter of the CorcL Showing thetransversely-cat medullated nerve fibres, the neuroglia between them with two branched neuroglia cells. (Atlas.)
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