1905.] 



Cord of the Macaque Monkey. 



93 



3. Eatio of the ventral to the dorsal horns. 



4. Eatio of the dorsal and of the ventral horns to the total area of the 



cross-section of the cord. 



5. Eatio of the dorsal and of the ventro-lateral columns to the dorsal horns. 



6. Eatio of the dorsal and of the ventro-lateral columns to the ventral 



horns. 



7. Eelative increase and decrease in the sectional area of the cord and of 



each of its component parts. 

 C 1. Diagrams. General configuration of the lumbo-sacral and coccygeal 

 cord in sectional area. 

 2. Outline drawings of the cross-sections of the cord in the region of each 

 spinal nerve. 



Al. — Areas of the Cross-sections of the Spinal Cord and of the Grey and of the 

 White Substance in the Region of each Spinal Nerve. 



DI 



im. 

































































c 







































































\ v. 











--" 



























— X_ 



l L, 1 L, \ 





I Lumbar II 

 Chart I 



•2 4, 

 11 



IV 



4| 6 



■2 |4 



LS<zc/:II 



ni w 



2 4 6 f 



Curves showing the Areas of the Cross-sections of the Spinal Cord and of the 

 Grey and of the White Substance (Tables I, II, III). 



The ordinates denote section area in square millimetres, the abscissae the length of the 

 cord in centimetres measured from the uppermost section in the first lumbar region. The 

 numbers (I, II, III, etc.) mark on abscissa line the approximate cephalic end of the 

 region of each pair of spinal nerves. 



Total area of the cross-section of the cord C, thick continuous line. 



Section area of the grey substance G, dotted line. 



Section area of the white substance W, thin continuous line. 



VOL. LXXVIII. — B. I 



