238 



THE DEVELOPMENT OF THE CHICK 



there bifurcates, producing two branches, one of which grows 

 towards the head and the other towards the tail in the dorsal 



CoJ. 



Fig. 142. — Six centripetal axones of the dorsal 



root, rigorously copied from a good preparation 



prepared according to the method of Golgi. 



From a longitudinal and tangential section of 



the dorsal column of the spinal cord of an 8- 



day chick. (After Ramon y Cajal.) 



Col., Collaterals. 1, 2, 3, 4, 5, 6, the axones 

 entering the cord. 



column of the white matter. The ascending and descending 

 branches send off lateral branches, collaterals, which pass deeper 

 into the cord, and ramify in the gray matter of the dorsal horn. 



