1L8 Miss M. P. FitzGerald. The Lumbosacral-coccygeal [June 17, 

 i n m ay t "vi w i jl m w i n jk 



V8 

 0-6 



< 



0-4 

 0-2 



































































A 















>—. — 













































































p 

























































1 



- 



I I I IT 



lumbar 



vr vh 



i i m xr 



Sacral 



I I BE 



Coccygeal 



o-s 



0-6 



04 



0-2 



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

 Ventro-lateral Columns (A, line and dot) to the "White Substance as a whole (W). 



The white substance in each cross-section of the cord is taken as unity. Mean figures 

 are plotted (Table X). The abscissae denote the spinal nerve regions, the ordinates the 

 ratio at the corresponding regions. 



The ratio ^ orsa ^ c °l umns (P) (Chart XI, Table X) increases slightly from 

 white substance (W) v ' ' ° J 



the first lumbar region to the second, and remains the same in the third. 



It decreases from the fourth lumbar to the first sacral region, being the same 



in both the sixth and seventh lumbar. Through the sacral regions and the 



first coccygeal the ratio varies very little ; it again decreases in the lower 



coccygeal regions. 



The two curves being complementary, the above remarks apply inversely 

 ventro-lateral columns (A) (Chart XIj Table X) _ 



to the ratio 



white substance (W) 



