86 Anatomy of the Nervous System 



back on each ventro-lateral aspect of this region to the mid- 

 brain. It is formed by fibres descending through the internal 

 capsule hiteral to the more anterior parts of the thalamus 

 and turning back to run to various lower parts of the central 

 nervous system as has already been described. These are 

 accompanied by many fibres which end in the thalamus 

 itself, so that even by the time it reaches the midbrain the 

 tract is already considerably smaller than when it started. 



