Huber-DeWitt, Neiiro-tendinoiis End-organs. 189 



cular end, while in the rabbit, the end-organs were 0.24 to 0.79 

 mm. long and 0.02 to o. 1 1 mm. broad, while Golgi gives them 

 as varying in length from 300 ;z to 800 ;/ and in breadth from 

 80 /z to 120/Z. Ciaccio mentions a neuro-tendinous organ found 

 in a woman, which was 2 to 3 mm. long and i-io to 1-5 mm. 

 wide. As our own observations have to do largely with the ter- 

 mination of the nerve in the neuro-tendinous end-organ, we have 

 made no measurements of the end-organs studied by us, but have 

 added here some measurements given by other observers ; this 

 to call attention to the great size of this end-organ, especially 

 in man. In preparations stained in methylen-blue and fixed in 

 ammonium picrate, cleared and teased and mounted in glycer- 

 ine ammonium picrate, the end-organs are usually, as we have 

 stated, somewhat flattened ; we have therefore felt that our 

 measurements would not be wholly accurate ; in longitudinal 

 sections it is somewhat difficult to obtain a section of the entire 

 end-organ in one preparation. 



Compound spindles, as mentioned by Ciaccio, have been 

 not infrequently noticed by us, and we have represented (Plate 

 XVII, Fig. 23) a triple one taken from the rat. 



We have found neuro-tendinous end-organs in the tendons 

 of practically all muscles studied, but they are especially nu- 

 merous, or at least more easily found, in connection with cer- 

 tain muscles, as for instance in the large fascia of the back mus- 

 cles and in the tendons of the interossei of the foot of the rab- 

 bit and in the tendons of the gastrocnemius, tibialis posticus 

 and extensor longus digitorum of the cat. Something of the 

 number and relative position of these organs may be seen from 

 a figure given by Golgi and reproduced by Barker in his Text- 

 book of the Nervous System, of the back muscles of the rab- 

 bit. Preparations similar to that reproduced by Golgi, we have 

 often made. 



The position of the neuro-tendinous end-organ is, in nearly 

 all cases, in the transition zone between muscle and tendon, and 

 one extremity is attached to muscle, while the other becomes 

 continuous with tendon fasciculi. But Ciaccio notes that in the 

 tendon of the superior rectus (eye) in man, he has found certain 



