HuBER, Neiiro-tendinoiis End-organs. 155 



toward the ocular tendons of the muscles. I was more im- 

 pressed with this fact because direct examination proved that 

 the region of the distribution of the motor end-plates in these 

 muscles is almost confined to the middle portion of the fleshy 

 mass of the muscles. Further investigation of the course and 

 destination of the nerve-fibers at the tendon end of the muscles 

 revealed them (both in cat and monkey) undergoing terminal 

 sub-division and in very numerous instances passing beyond 

 into the bundles of the tendon itself. The termination of many 

 of the bundles of the nerves lies within the tendon ; many re- 

 curve again toward the muscular fibers and end just at the junc- 

 tion of the muscle fiber with the tendon bundle." 



The motor endings need no further consideration as they 

 present no structural peculiarities. 



The nerve fibers terminating in the tendinous portion of 

 the eye-muscles pass forward beyond the region of the motor 

 endings, as small bundles consisting of two, three, four or even 

 more small medullated fibers. The small bundles have a rather 

 direct course, passing forward between the muscle fibers, ap- 

 proaching the surface of the muscle some distance before the 

 tendon is reached. Three such small bundles are represented 

 in the accompanying figure. After leaving the fleshy portion 

 of the muscle, these bundles pass forward into the tendon for a 

 short distance, usually on its outer surface, although now and 

 then in the substance of the tendon. The termination of these 

 fibers is in end-organs situated for the most part just beyond 

 the fleshy portion of the muscles. One or two nerve-fibers go 

 to each end-organ. Many nerve fibers pass forward beyond 

 their point of termination for a short distance, to recurve again 

 toward the muscular fibers before ending, as Sherrington (5) has 

 correctly stated. Others approach the end-organs more di- 

 rectly, entering them either at their distal (which seems to me 

 the more common) or their proximal ends. As the nerve fibers 

 approach the end-organs, the internodal segments become 

 shorter (this Sherrington has observed); the axis cylinders do 

 not, however, become thicker. In this respect my observations 

 o not corroborate Sherrington's (5) if, in the following state- 



