

PATHWAYS FROM THE BRAIN TO THE SPINAL CORD 



871 



indirectly by terminals and collaterals about the motor cells in the anterior column 

 on the side opposite from their origin in the red nucleus. A few are said to pass 

 down on the same side. Since the red nucleus is intimately related to the cerebellum 

 by terminals and collaterals of the superior peduncle which arises in the dentate 

 nucleus of the cerebellum, the rubrospinal fasciculus is supposed to be concerned 



Internal 

 capsule 



Decussation of pyramids 



Anterior cerebrospinal fasciculus 

 Lateral cerebrospinal fasciculus 





-, Anterior nerve roots 



FIG. 764. The motor tract. (Modified from Poirier.) 



th cerebellar reflexes, complex motor coordinations necessary in locomotion and 

 equilibrium. The afferent paths concerned in these reflexes have already been 

 partly considered, namely, the dorsal and ventral spinocerebellar fasciculi, and 

 probably some of the fibers of the posterior funiculi which reach the cerebellum by 

 the inferior peduncle. 



The tectospinal fasciculus arises from the superior colliculus of the roof (tectum) 



