102 



THE ESSENTIALS OF HISTOLOGY. 



neural sheath, then the medullary sheath, and lastly the primitive 

 sheath, the axis-cylinder being alone continued as a bundle of primitive 



FIG. 123. MAGNIFIED VIEW OF A PACINIAN BODY FROM THE CAT'S MESENTERY. 



(Ranvier.) 



n, stalk of corpuscle with nerve-fibre inclosed in sheath of Henle passing to the corpuscle ; 

 n', its continuation through the core, m, as axis-cylinder only ; a, its terminal arborisa- 

 tion ; c, d, sections of endothelial-cells of tunics, often mistaken for the tunics themselves ; 

 /, channel through the tunics which expands into the core of the corpuscle. 



fibrils (fig. 125, n). This branches and joins with the ramifications, 

 of the axis-cylinders of neighbouring nerve-fibres to form a primary 



