428 JOHN H. STOKES 



shown. The section also pictures very satisfactorily the groove 

 in the medial surface, in which lies the nucleus with its covering of 

 scattered strands and explains its failure to show in the figure of 

 the lateral aspect (fig. 1). The letter B directs attention to the 

 group of fibers from the nucleus lemnisci lateralis towards the 

 median line, which was mentioned above among the details in- 

 cluded in the model of the cochlear apparatus. The fibers can 

 be traced quite definitely to the median line and a part of them at 

 least show every indication of connection with the median longi- 

 tudinal fasciculus. In the sections where this structure is most 

 conspicuous, decussation of most of its fibers with those of the 

 opposite side undoubtedly occurs. Attention may also be called 

 to a somewhat similar but smaller and shorter group of fibers 

 from the region of the lateral lemniscus itself, marked A in the 

 figure. They are lost in the central grey and show no signs of 

 any relation to those of the opposite side. In Weigert prepara- 

 tions at least, they appear to be quite distinct from the group just 

 described. 



As regards the association of the first-mentioned group of fibers 

 with any definite group of cells in the nucleus lemnisci lateralis 

 the sections somewhat anterior to the one shown, present every 

 indication that such is the case. In one of these sections a definite 

 almond-shaped mass of cells, probably the anterior superior end 

 or superior division of the nucleus lemnisci lateralis appears as 

 the point of origin of the fine fibrils uniting to form the strands in 

 question. Of the relation of the tract to the brachium conjunc- 

 tivum little can be said from these preparations except that the 

 fibers under discussion appear coincidently in the section with 

 the first signs of an approaching decussation of the brachium, 

 but are readily distinguished from these latter by their greater 

 delicacy and the relative absence of clumping into strands. Be- 

 fore the decussation of the brachium has reached decided pro- 

 portions the tract in question has completely disappeared from 

 the field. The general impression gained from these preparations 

 is that any relation to the brachium conjunctivum is incidental 

 rather than fundamental. 



