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

 i iritTVT'vrw i n i i i i m 

































































■*\ 































V 



r 































V 



















































































































A. 













> 









*- — • 











yf 































p 

































10 

 9 

 8 

 7 

 6 

 5 

 4 

 3 

 2 

 1 



i n i ir t Ti w I n i y i n: tsl 



liunibccr Sacral CoccyqeaZ> .' 



Total White Substance 



Chart X. — Curves showing the Relative Values of the Ratios 



Grey Substance 



,,, r ,. ,. > Dorsal Columns /r> , , v , Ventro-lateral Columns , . 



(\V, continuous line), ^ — -r— (P, broken line), — — (A, 



Grey Substance Grey Substance 



line and dot) (Table IX). 

 The ratio in the first lumbar region is in each case taken as 10 (see Table VIII). The 

 abscissae denote spinal nerve regions, the ordinates relative value at corresponding regions. 



Table IX. — Kelative Values of the Eatios 



Total White Substance 



Grey Substance 



Dorsal Columns Ventro-lateral Columns 



o , , and ^ , , The ratio m the 



Grey Substance Grey Substauce 



I Lumbar region is in each case taken as 10 (Chart X). 



Region of cord. 



Total white 

 substance. 



Dorsal columns. 



Ventro-lateral 

 columns. 



Lumbar — 









I 



10 -o 



10 -o 



10 -o 



II 



7-7 



7-9 



7-5 



Ill 



6-4 



6-8 



6 -4 



IV" 



4-9 



4-8 



5 



V 



3-8 



3-6 



3-9 



VI 



3 3 



2-8 



3-6 



VII 



3-1 



2-6 



3-2 



Sacral — 









I 



3 1 



2 -3 



3-2 



II 



2-8 



2-3 



3 -1 



Ill 



2-8 



2-3 



3-0 



IV 



2-6 



2-1 



2-8 



Coccygeal — 









I 



2-3 



1 -8 



2 -5 



II 



2-4 



1-7 



2-7 



Ill 



2 5 



1-5 



3 -1 



