Volume 1

Quain's elements of anatomy / edited by Edward Albert Schäfer and George Dancer Thane.

Date:
1895-1898
Catalogue details

Licence: Public Domain Mark

Credit: Quain's elements of anatomy / edited by Edward Albert Schäfer and George Dancer Thane. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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    postero-lateral white column, with the longitudi- nal fibres of which its fibres become continuous ; from this column many of them sweep with bold curves into the adjacent grey matter. At their entrance into the cord their direction like that of the bundles of fibres of the anterior roots is in most regions of the cord obliquely upwards. Fig. 18.—Longitudinal section of the posterior column OF THE SPINAL CORD OF A CHICK ON THE StH DAY OP INCUBATION (Ram6n y Cajal). TLis figure shows the course of 5 entering fibres of the posterior root and some of the longitudinal fibres of the posterior cohimn. A, A, fibres of the posterior root; B, bifurcation of one of them in form of a Y; C, D, origin of collateral branches ; E, fibres of -Goll's tract, also giving off colla- terals. Collateral fibres of the posterior roots and of the white columns.—It has been definitely shown by Kamon y Cajal, whose researches into this subject have been confirmed by Kolliker and v. Grehuchten, that the fibres of the posterior roots as they enter the cord join by a Y 01' T-shaped junction with longitudinal fibres of the posterior column ; in other words that they bifurcate as they enter the cord into two principal branches which run upwards and downwards in the posterior white column or in the adjacent part of the posterior cornu. It has also been proved by the same observers Pig. ] !>.—Transtbrsi! section op the OORD OP A OHIOK ON THE Oth DAY (Ram6n y Cajal). This figure shows collaterals passing into the grey matter from all the white columns of the cord. They are seen to form an especially close plexus in the posterior horn, just withfti the substance of Kolando, and in t he posterior commissure. c, central cajual ; v, anterior and d, posterior surface of the cord ; p, posterior roots.