338 



THE SPINAL CORD, BY J. GERLACH. 



is altogether composed of fine, unmingled with thick, fibres, 

 and is found in the upper dorsal, and through the whole of the 

 cervical, region, where it is separated off* from the posterior 

 columns towards the middle line by a strong septum. The 

 differences in the diameter of the fibres in the spinal cord of 



Fig. 220. Longitudinal section of one half of a spinal cord, from 

 right to left, through the middle of the anterior cornu in the lumbar 

 region of Man, treated with chloride of palladium and double chloride 

 of gold and potassium, by the aid of which the fibrillation, especially 

 of the lateral halves of the grey substance, is rendered extraordinarily 

 distinct. Magnified 50 diameters. <*, Lateral column ; 6, anterior 

 column ; c, entrance of the fibres of the anterior cornu into the lateral 

 column, in which they ascend ; d, lateral portion of the anterior cornu, 

 with fibres and cells of the lateral layer ; e } median portion of the an- 

 terior cornu. 



animals is much greater than in that of Man, the greatest 

 differences occurring in the cord of the lowest Vertebrata. 



As regards the quantitative relation between the nerve 

 fibres and the connecting neuroglia, the anterior and posterior 



