ii SENSIBILITY OF THE INTEENAL OEGANS 



95 



corresponding spinal ganglia and the peripheral sensory nerves 

 remain intact. 



A third nerve end-organ was discovered by Golgi (1880) in 

 both man and the higher vertebrates in the transitional region 

 between the tendons and 



the muscle - fibres, and is IfiHl 



known as the musculo - / / / 



tendinous organ or cor- 

 puscle. Such organs were T/JT^S^: 

 found by Marchi in the 

 tendons of the eye-muscles j j, 



(1881), and were studied fm '.fJjaRa 



in closer anatomical detail * Mr'--!*^ 



by A. Cattaneo (1888). $^6^ 



For the most part they are \ \ 



fusiform, sometimes cylin- Ai/fff 



drical, bodies of different 

 sizes with a smaller ten- 

 dinous end turned towards 

 the insertion of the tendon, 

 and a larger muscular end 

 turned towards the belly 'lw& s V mi 

 of the muscle. We cannot 

 enter into their structure, : in^mjj/$ 

 which is plainly shown in / f^t/Us, 

 Figs. 41, 42, and 43, taken ; [%;. 

 from Cattaneo and Euiii ni 



The sensory nerves and fi WJKn 

 nerve-endings of the joints 

 have been less studied ana- ;= 

 tomically, although clinical 

 experience has proved [" 

 their extreme sensibility 

 in cases of inflammation. 

 The articular cartilages 

 seem to be destitute of 

 nerves, but these are 

 abundant in the ends of 

 the bones, the periosteum, 

 articular ligaments, and 

 synovial capsules. Eauber found more or less modified Pacinian 

 corpuscles in the vicinity of nearly all the joints ; it is not yet" 

 known whether Golgi's organs are also present there. 



It follows from the preceding discussion that the active and 

 passive organs of movement are supplied with sensory fibres that 

 have three special end-organs, the modified Paciniau corpuscles, 

 the musculo-tendinous organs of Golgi, and the neuro-muscular 



FIG. 41. Two musculo - tendinous organs of rabbits, 

 treated with silver nitrate and osmic acid, enlarged 

 about 100 diameters. (A. Cattaneo.) d, bifurcation 

 point of a fibre that innervates two organs of Golgi ; 

 e., endothelium investing this organ; h., Henle's 

 sheath, which the nerve loses on entering the cor- 

 puscle ; m., muscle bundle united with the small 

 tendon of the organ of Golgi. 



