THE NERVOUS SYSTEM. 197 
Pe 
2 \tt7-hy- 
Fic. 102, DrAGRAM SHOWING THE RELATION OF SOME OF THE CELLS AND 
Fipers OF THE SPINAL Corp. Lateral aspect of the cord. 
a, Anterior median fissure; ac, cells of the anterior horn; an, anterior 
root of spinal nerve; c, axone; co, collateral fibers; e, fibers con- 
necting higher brain centers with cerebellum; fi, sensory fibers of 
fillet to the brain; g, gn, go, ganglion of posterior root; gr, gray 
matter; ir, fibers of the posterior sensory tract; /, fibers to cere- 
bellum; m, cell in the anterior horn or column of gray matter; 
n, spinal nerves; o, cells in the posterior horn or column of gray 
matter; nc, nucleus gracilis and nucleus cuneatus; mr, nucleus ruber; 
r, a fiber of posterior root; rb, ganglion cells of medulla; s, tract 
of fillet to the brain; sp, fibers of superior peduncle of the cere- 
bellum ; #’, fiber of crossed pyramidal tract; ts, point of decussation; 
v, division of fiber + into its cranial and caudal extensions; w, a 
collateral of the longitudinal fiber ir. 
