THE ASSOCIATION PATHS 



541 



After decussation the fibres of the brachinm conjunctivum are 

 immediately lost in the red nucleus of the opposite side. A few of 

 its fibres, however, are said to continue past the red nucleus with- 

 out interruption. These, together with neuraxes from the cells of 

 the nucleus ruber, enter ForePs field, and pass lateralward either 

 to the optic thalamus or to the lenticular nucleus. Their further 

 course is uncertain, but it seems probable that from these points 

 new neurones continue the path through the corona radiata to the 

 cerebral cortex. Each cerebellar hemisphere is thus placed in inti- 

 mate relation with the opposite half of the cerebrum. 



The path of the branchium conjunctivum, like all the other 

 association tracts, contains fibres which run in both directions. It 

 is therefore a tract of more or less mixed degeneration. 



The Middle Cerebellar Peduncles. Fibres from the cerebellum 

 also enter the middle cerebellar peduncles and pass to the crusta of 



FIG. 412. DIAGRAM OF THE FIBRE PATHS OF THE SPINAL CORD. 

 The black cells are of the sensory or centripetal paths, those on the left are spinal 

 ganglion cells whose branches may be traced to their several terminations within the 

 spinal cord. The motor cells of anterior horn on the right are white ; commissural cells 

 are vertically striped ; the small cells of the dorsal horns are horizontally striped ; a 

 small " Golgi cell " of the dorsal horn is stippled. (Redrawn after the scheme of 

 von Lenhossek.) 



the pons, where they end in terminal arborizations about those 

 nerve cells, of the same and opposite sides, which are scattered 



