1905.] 



Cord of the Macaque Monkey. 



135 



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r 

























-y 

 /" 





















































X > IE HI 

 Lumbar 



VIE. 



x in sl 

 SctcraZ 



I I 1L 



Coccyge-aZ 



Chart XVIII. — Curves showing the Ratio of the Dorsal Columns (P, broken line) and of 

 the Ventro- lateral Columns (A, line and dot) to the Ventral Horns (V). 



The ventral horns taken as unity in each cross-section of the cord. Mean results are 

 plotted (Table XIX). The abscissae denote spinal nerve regions, the ordinates ratio at the 

 corresponding regions. 



Eati0 dorsal columns (P) ^ xym T ^ x 

 v ' ventral horns (V) v ' 



The ratio , d Qrsa l columns (P) decreases f rom the first to the sixth lumbar 

 ventral horns (V) 



region, the decrease being rapid to the fourth. It remains nearly the same 

 from the sixth lumbar to the fourth sacral region, decreases slightly in the 

 first coccygeal region and varies very little in the second and third. 



(b) Eatio ventro-lateral columns (A) (Charfc xvm TaMe XIX) 

 v ' ventral horns (V) v ' 



rpi , ■ ventro-lateral columns (A) n . „ » u . . 



Ihe ratio )—{ decreases rapidly from the first to the 



ventral horns (V) 



sixth lumbar region. The decrease is very marked in the second, third, and 



fourth, but it is less in the third than in the second, and is again less in the 



fourth than in the third. The ratio increases very slightly from the sixth 



lumbar to the first sacral region and remains approximately the same 



