5i8 



COMPARATIVE ANATOMY 



The ventral spinocerebellar tract, which consists of fibers from cells 

 of the dorsal column. These fibers reach the cerebellum by way of the 

 pons. 



The lateral and ventral spinothalamic tracts which include fibers 

 from the dorsal column which cross to the opposite side and finally reach 

 the thalamus. 



Bocsat Root 



Ventral Rod 



Ramus 

 dorjetis 



Ramus 

 comm. 



amus 

 ventralis 



Fig. 432. — Diagram of the nerve components of a spinal nerve. Somatic motor 

 fibers are indicated by continuous lines; visceral motor in long broken lines; somatic 

 sensory in short broken lines; visceral sensory by fine dotted lines. (From B. Patten, 

 after Froriep.) 



The more important descending fiber tracts are: 



The lateral corticospinal or crossed pyramidal tract, which contains 

 fibers from pyramidal cells in the cerebral cortex of the opposite side. 

 The telodendria end in the gray matter of the cord in relation to the 

 somatic motor neurons, and form part of the mechanism of voluntary 

 control. 



