286 



NORMAL HISTOLOGY. 



The anterior column includes two tracts : the direct pyram- 

 idal tract (TurcKs column), next the median fissure, and the 



FIG. 319. 



Diagram showing principal divisions of white matter of spinal cord: A, P, anterior and 

 posterior horns of gray matter ; DP, direct pyramidal tract ; GB ', anterior ground-bundle ; 

 CP, crossed pyramidal tract; DC, direct cerebellar bundle; GT, Gowers's or ascending 

 antero-lateral tract, blending anteriorly with descending antero- lateral tract ; L, Lissauer's 

 column ; BG, column of Burdach (fasciculus cuneatus) and column of Goll (fasciculus gra- 

 cilis) ; LGB, lateral ground-bundle. 



anterior ground-bundle, or anterior radicular zone, which is 

 continuous with the adjoining area of the lateral region. 



The lateral column contains a number of important tracts, two 

 of which are especially prominent, the crossed pyramidal and the 

 direct cerebellar. The latter lies as a narrow zone at the margin 

 of the cord, and extends from the posterior root about half-way to 

 the anterior root. The crossed pyramidal tract appears as an 

 oval area which lies next the cerebellar path and in front of the pos- 

 terior root. The remainder of the lateral column is occupied by a 

 number of smaller tracts, concerning which uncertainty still exists. 

 These may be grouped into two segments : an outer peripheral, in- 

 cluding the ascending antero-lateral tract, or tract of Gowers, 

 and the descending antero-lateral tract, and an inner zone, next 

 the gray matter, the lateral ground-bundle ; the latter, in con- 

 junction with the similar anterior tract, constitutes the antero-lat- 

 eral ground-bundle. 



The posterior column is divided by a fibrous septum into the 

 inner triangular segment, the column of Goll, next the median 

 septum, and an outer area, the postero-lateral tract, or Burdach's 

 column, lying between Coil's tract and the posterior horn and root. 



