1 82 Journal of Comparative Neurology. 



proceed for a variable distance along the tendon fasciculi, some 

 as simple varicose fibrils, like those described for the frog, but 

 most of them beset by round, oval, or oftener very irregular 

 enlargements, either resting directly on the fiber or supported 

 by a longer or shorter pedicle. These enlargements, which so 

 sharply distinguish this end-plaque from that of the frog, vary 

 markedly in size and form. Sometimes a fine branch serves as 

 a pedicle for one or several granular enlargements, pear shaped, 

 irregularly quadrangular or polygonal or leaf-like or resembling 

 a large plate beset on several sides by sharp thorns or triangular 

 or quadrangular or oval bud-Uke projections. Sometimes the 

 non-medullated nerve fiber itself enlarges and is beset with 

 secondary enlargements of the most varied size and shape. 

 Sometimes a single enlargement rests on a rather long stem ; at 

 other times, the pedicle itself is adorned with other sessile or 

 pedunculated enlargements, or may divide at its extremity into 

 two or three branches, each supporting one or more of the en- 

 largements. Thus the plaque may be quite simple or much 

 more complex. Sometimes the nerve enters the ending, the 

 branches with their terminal tufts spreading in opposite direc- 

 tions. Sometimes it enters at one extremity, all the branches 

 extending in the same direction, more closely resembling a 

 bush whose branches are adorned with the most fantastic foli- 

 age. Sometimes the main nerve fiber breaks up near its ex- 

 tremity into a large number of fine branches, coming off at differ- 

 ent closely approximated nodes, each branching repeatedly and 

 ending in the characteristic end-plaque, the whole somewhat 

 resembling in general appearance, though not in the minuter 

 structure, the large, bushy ending described and figured for 

 the frog. 



In Plate XJV, Fig. 5, we have represented one of the 

 simpler endings, which has been very much flattened out, so 

 that the form and relative size of the final tufts and their rela- 

 tion to the nerve fiber are very well shown, with no attempt to 

 represent the relation to the tendon fasciculi. The medullated 

 nerve sends off two medullated branches from neighboring 

 nodes, each ending in a short, simple tuft. The nerve finally 



