346 



PHYSIOLOGY 



CHAP. 



Subsequent research, especially by Miescher (1870), Nawrocki 

 (1871), Woroschiloff (1874), iu Ludwig's laboratory, led to results 

 which absolutely contradicted Schiff's conclusion that the lateral 

 columns do not transmit sensory impressions. 



Woroschiloff, who made all his experiments on rabbits, found 

 that after dividing the dorsal and ventral columns and the whole 

 of the grey matter in the lower thoracic region, the transmission 

 of sensory and motor impulses was mot affected ; after section of 

 the two lateral columns, on the contrary, both are abolished, and 

 all reflex relations between the posterior and anterior portions of 



FIG. 193. Section of both lateral columns and of a lateral portion of both horns of the grey 

 matter level of last dorsal vertebra. (Woroschiloff.) 



the body are minimal (Figs. 192, 193). From these experiments 

 he concluded that the lateral column contained both motor and 

 sensory paths. 



From a subsequent study of the effects of transection of the 

 cervical cord of the rabbit, Woroschiloff (1878) obtained similar 

 results, and demonstrated that the sensory and motor paths for 

 the fore-limbs also run in the lateral columns. The motor paths 

 lie principally on the same side, the sensory on the side opposite. 



This last assertion, which agrees with Brown-Sequard's theory, 

 is contradicted by some important later experiments on higher 

 mammals (dogs, monkeys), which tend to show that the conduct- 

 ing paths for sensibility only cross to a minor extent in the cord. 



Among these experiments those of Mott (1892) on the effect 

 of heuiisection of the cord in monkeys deserve special attention. 



