790 



THE NERVOUS SYSTEM 



Fig. 621. — Schematic Representation of the More Important Architectural Relations 

 OF Neurones in the Spinal Cord, Omitting those Involving the Mesencephalon 



AND Thalamus. 



a, afferent (spinal gangUon) axone of spino-cerebral chain with bifurcation and caudal branch ; 



b, afferent axone coursing in Lissauer's zone and distributed wholly within the cord; 



c, collaterals of a and b disposed in three ways; p, pyramidal axone in lateral (crossed) 

 cerebro-spinal fasciculus distributed to levels of grey substance; pa, axone in ventral cerebro- 

 spinal fasciculus decussating before termination; v, ventral root or motor neurones; n, 

 nucleus dorsahs giving axone to dorsal spino-cerebellar fasciculus; g, ascending neurones 

 of Gowers' tract; d, descending axone from cerebellum (probable); fp, neurones of fasciculi 

 proprii, association proper; h, commissural neurones; e, Golgi cell of type II. 



