LECTURES ON THE CENTRAL NERVOUS SYSTEM. 



tegmental radiation. Its fibres pass out of the internal capsule, 

 and, to a great extent, lie outside of and above the red nucleus, 

 surrounding about a third of that ganglion like a capsule; pass- 

 ing back of the red nucleus they form a tract of fibres which 

 we shall learn to know as the lemniscus, laqueus, or fillet. In 

 Fig. 52 the course of these fibres is shown in diagram. At the 



FIG. 54. 



Subthalamic region of a 4-week-old child. Frontal section. Compare Fig. 51, where 

 only the teginental tract is clearly visible. 



tip of the lenticular nucleus the fibres from its different divisions 

 and from the ansa lenticularis unite to form a thick bundle. 

 This passes through the capsule (Fig. 52) in numerous fasciculi 

 and enters into a net- work which closely surrounds the corpus 

 subthalamicum. From this net-work most of these fibres pass 

 into the ganglion itself; a few, however (but of this I am not 

 firmly convinced), pass directly from the nucleus lentiformis to 



