340 



OF THE PRIMARY TISSUES OF THE HUMAN BODY. 



liker, 1 it is rare among the higher animals for a single vesicle to be thus con- 

 nected with more than one nerve-tube, although two or more are frequently 



Fig. 108. 



Connection between nerve-fibres and nerve-corpuscles ; from the roots of a spinal nerve of the ray. A. A 

 nerve-corpuscle, escaped by pressure from the capsule formed around it by the dilated sheath of the nerve- 

 tubule : it shows also the gradual disappearance of the outer portion of the substance of the nerve as it comes 

 into relation with the corpuscles. B. A nerve-corpuscle inclosed within a dilated portion of the sheath of a 

 nerve : part of the granular material of the corpuscle is continuous with the central substance of the nerve 

 in the course of which it is inserted. 



found to issue from the same corpuscle in Fishes and Reptiles ; and he regards 

 the remaining prolongations of the stellate cells in the light of nervi nervorum. 

 It appears certain, however, that there are many ganglionic vesicles which do 

 not possess, any such connection with nerve-fibres; whilst on the other hand, it 

 seems possible that there may be nerve-fibres which have no such central termi- 

 nations, but which simply enter the ganglionic masses, pass around and amongst 



Fig. 109. 



Fig. 110. 



From the Gasserian ganglion of an adult: a, a. 

 Ganglion globules with their nucleus, nucleated cap- 

 sule, and pigment, t. Tubular fibres, running among 

 the globules in contact with their capsule, g. Gelati- 

 nous fibres also in contact with the ganglion globules. 

 Magnified 320 diameters. 



A small piece of the otic ganglion of 

 the sheep, slightly compressed ; showing 

 the interlacement of the internal fibres, 

 and the vesicular matter. (After Valen- 

 tin.) 



the cells, and then emerge without having undergone any distinct change, save 

 that they present a soft and varicose appearance whilst threading their way be- 

 tween the vesicles (Figs. 109 and 110). This appearance, according to Mr. 

 Newport, may be distinguished in the ganglia of the dorsal column of Articulated 



1 See his "Neurological Observations," in "Kolliker and Siebold's Zeitschrift" for 1849, 

 and his " Mikroskopische Anatomic," band ii. 



