82 



THE NERVOUS SYSTEM 



thick mantle surrounding the gray columns. In each lateral half of the cord it 

 is divided into the three great strands or funiculi, which have been described 



White matter. 



Grey matter. 



-Ertrire secMon. 



1OO 



o 



eo 



40 

 20 



I II lfl IY 



WIYIO 1 H HI W Y H MI H1I IX X XI XII 1 II IfllVYI 



Fig. 59. Curves showing the variations in sectional area of the gray matter, the white matter, and 

 the entire cord in the various segments of the human spinal cord. (Donaldson and Davis.) 



on the surface of the cord. The anterior funiculus (funiculus anterior) is bounded 

 by the anterior median fissure, the anterior column, and the emergent fibers 

 of the ventral roots. The lateral funiculus (funiculus lateralis) lies lateral to 



V//C- VII I C 



vine -ID 



II D 



VII D 



XII D 



III S 



IV 5 C 



Fig. 60. Outline drawings of sections through representative segments of the human spinal cord. 



the gray substance between the anterolateral and posterolateral sulci, i. e., 

 between the lines of exit of the ventral and dorsal roots. The posterior funiculus 

 (funiculus posterior) is bounded by the posterolateral sulcus and posterior col- 



