798 



PHYSIOLOGY OF THE DOMESTIC ANIMALS. 



The other systems of fibres terminate in the medulla oblongata, the 

 column of Goll serving to connect part of the fibres of the posterior 

 roots with the gray nuclei of the funiculi graciles of the medulla 

 oblongata; and the column of .Burdach the posterior roots through the 

 restiform body with the vermiform process of the cerebellum, while the 

 anterior and lateral mixed columns communicate with the formatio 

 reticularis of the medulla oblongata. 



Of these columns the pyramidal tract, the cerebellar tract, and the 

 column of Goll are the only ones which steadily increase in size as the 

 medulla oblongata is approached. 



eaop 



FIG. 340. COURSE OF THE FIBRES IN THE SPINAL, CORD, AFTER F. FLESCII. 



(Thanhoffcr.) 



Ms, anterior horn ; ffn, posterior horn ; my, anterior root ; m(j, 1, 2, 3, fibrous bundles of the anterior 

 root; kg, posterior root; hy, 1, 2, fibrous bundles of the posterior root: mlp, direct pyramidal tract; olp, 

 crossed pyramidal tract ; oak, lateral ground-bundle ; eaop, direct cerebellar tract ; nmk, anterior ground- 

 bundle ; he, central canal: Co, intermedio-lateral column of Clarke ; G, funiculus gracilis of Goll ; B, 

 funiculus cuneatus of Burdach ; x, oblique bundles of fibres. 



If we trace by means of the microscope the origins and terminations 

 of the spinal nerves it will be found that the posterior roots of the 

 spinal nerves pass through the white substance of the cord to reach the 

 posterior gray column, in which they break up into fine twigs, uniting 

 with the ganglia of the cord, although their mode of connection with 

 the cells is not capable of ready detection. Having entered the cord. 

 the fibres of the posterior nerve-roots are seen to divide into three 

 different bundles. 



The fibres of the anterior roots may likewise be divided into three 



