CHAP, v.] 



THE SPINAL CORD. 



603 



was still felt. Similarly, as was stated on p. 577, cases have been 

 recorded where the sensation of pressure was retained but that of 

 temperature impaired or lost, and vice versa. Such cases however 

 have not as yet afforded any clear insight as to what are the actual 

 paths of the respective sensory impulses. While they do not oppose 

 they do not distinctly confirm the view we are speaking of as to the 

 particular paths of these several kinds of impulse. Nor indeed can 

 this view, either in its more general or in its more elaborate form, 

 be considered as adequately supported by experimental evidence. 



For the investigations of other observers, especially the more 

 recent ones, including those conducted by the blood-pressure 

 method, largely concur in shewing that along the cord, at all 

 events in the dorsal region, both volitional and sensory impulses, 

 indeed we might say impulses of all kinds passing between the 

 brain and various parts of the spinal cord, or between distinct 

 parts of the cord itself, run in the lateral columns. This view is 

 further supported by the anatomical facts that the lateral 

 columns (Fig. 81) increase in bulk from below upwards to a much 

 greater degree than do either the anterior or posterior columns 

 (Figs. 82, 83), and that after certain diseases or injuries of the brain 



v iv in ii i v iv 111 ii i xii xi x ix vni vu vi v iv in n i VIH vii vi v iv 



Fro. 81. DIAGRAM SHEWING THE VARIATIONS IN THE SECTIONAL AREA OP THE LATERAL 



COLUMNS OF THE SPINAL CORD, ALONG ITS LENGTH. 



.1 



V IV III II | V IV III II I XII XI X IX VIII VII VI V IV III II I VIII VII VI V IV III II | 



. 82. DIAGRAM SHEWING THE VARIATIONS IN THE SECTIONAL AREA. OF THE ANTERIOR 



COLUMNS OF THE SPINAL CORD, ALONG ITS LENGTH. 



0. 



I V iv in n i v iv in u i xii xi x ix v::i vn vi v ii/ in n i vm vu vi v iv m n i 



FIG. 83. DIAGRAM SHEWING THE VARIATIONS IN THE SECTIONAL AREA OF THE POSTERIOR 

 COLUMNS OF THE SPINAL CORD, ALONG ITS LENGTH. 



