SPECIAL END OEGANS. 



865 



far as its distal end and there terminates in one or more enlargements in which 

 the neuro-fibrillse form a dense plexus. The corpuscles of Herbst (Fig. 743), which 

 are found in the skin of birds, differ from the Pacinian corpuscles in that their 

 cores consist of nucleated cells, between which the axis cylinder extends as a single 

 or branched process. 



(4) Corpuscles of Golgi and Mazzoni. These are present in the subcutaneous tissue 

 of the pulp of the fingers and also in other parts of the skin. Their capsules are 

 thinner and their cores thicker than those of the Pacinian corpuscles, while their 

 axis cylinders undergo a greater degree of ramification and their terminal filaments 

 end in somewhat flattened expansions. 



(5) Tactile Corpuscles of Wagner and Meissner (Fig. 742). These are plentifully 

 distributed in the papillae of the corium of the hand, foot, and front of the forearm. 

 They are found also in the skin of the lips, in the mucous membrane of the tip of 

 the tongue, in the palpebral conjunctiva and the skin of the nipple. They are 

 oval in shape, and their length varies from -04 mm. to -15 mm., and their 

 thickness from -03 mm. to '06 mm. One or more nerve-fibres pierce the capsule 

 of the corpuscle, losing, at the same time, their medullary sheaths. The axis 

 cylinders, which are frequently varicose, assume a spiral or convoluted course and 

 end in terminal enlargements. From the deep surface of the capsule imperfect 

 membranous septa are continued inwards between the nerve ramifications. 



744. AN ORGAN OF RUFFINI FROM THE SUBCUTANEOUS TISSUE (Ruffini). (From Quain's Anatomy.) 

 a, Entering nerve-fibres ; b, d, endings of their axons ; e, c, capsule of organ ; c', core. 



(6) Organs of Ruffini (Fig. 744). These were found by Euffini in the sub- 

 cutaneous connective tissue of the fingers. They are of considerable size, and their 

 shape is oval or fusiform. One or more nerve-fibres penetrate the side of the capsule, 

 within which they pursue a curved course and then lose their medullary sheaths. 



Th( 



FIG. 745. ORGAN OF GOLGI FROM THE HUMAN TENDO-CALCANEUS, CHLORIDE OF GOLD 



PREPARATION (Ciacceo). (From Quain's Anatomy.) 

 m, Muscular fibres ; t, tendon bundles ; G, Golgi's organ ; n, two nerve- fibres passing into it. 



e axis cylinders break up into a close-meshed network which lies between, or 

 partly encircles, the smaller fasciculi of connective tissue. 



(7) Neuro-tendinous Spindles (Fig. 745). These were first described by Golgi in 



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