Huber-DeWitt, Neiiro-tc7idinoiis End-orga7is. 20 1 



the neuro-tendinous end-organ and ended therein in the charac- 

 teristic arborization and end-plaques. 



We have, also, observed in a few cases, the fact mentioned 

 by Cattaneo _and emphasized by Ruffini, that the so-called 

 Golgi-Mazzoni organs are found sometimes in and sometimes 

 under the capsule of the neuro-tendinous end-organs. Our ob- 

 servations, however, even with the most perfectly stained prep- 

 arations, have not led us to conclude that this relation is so 

 constant, even in the end-organs of the cat, as Ruffini's descrip- 

 tions would seem to indicate. We have found many end-organs 

 perfectly stained, in which no trace of a Pacinian or Golgi-Maz- 

 zoni organ was to be seen. In other preparations, these organs 

 were found in or under the capsules. The fact that this is a 

 region where sensory nerves and sensory endings seem to 

 abound ; that sensory endings of many kinds are found here, 

 sometimes in relation with the neuro-tendinous end-organs and 

 sometimes not ; and that the nerve supply, as Cattaneo has 

 stated, is usually independent, would lead us to conclude, as 

 did Cattaneo for the neuro-muscular spindle, that the relation is 

 purely accidental. 



As to the encapsulation of the neuro-tendinous end-organs, 

 different opinions are expressed by the different authors who 

 have worked on this subject. Golgi and later Cattaneo, finding 

 that the nerve endings in tendon, in the lower types of verte- 

 brates (amphibia and reptilia) were free, while those in the 

 higher types (birds and mammalia) possessed a distinct capsule, 

 drew the natural conclusion that the capsule was the result of a 

 higher development of the organ ; that the end-organ in mam- 

 malia was but the result of a condensation of connective tissue 

 about the tendon fasciculi and a number of the free endings 

 thereon, in the amphibia. Ciaccio, however, having observed 

 the fact, already cited, that in the bat, the end-organs of the 

 anterior extremity were free, while those of the posterior ex- 

 tremity were encapsulated, decides that Golgi and Cattaneo 

 were wrong and that the capsule is not the result of such devel- 

 opment and condensation. 



As noted before, we have found the tendon nerve endings 



