272 



PRACTICAL ANATOMY. 



The gray or vesicular matter consists of vesicles or 

 cells, which vary in size from -g-^Viy to "fftir * nc h ^ n 

 diameter. They are globular, with one, two, or more 



FIG. 117. STRUCTURE OF NERVE-ELEMENTS. 



1, primitive fibrilla; 2, axis-cylinder : 3, Remak'8 fibres : 4, mednllated varicose fibre ; 

 5, 6. medullated fibre, with Schw'ann's slieath ; C, neurilemma; t, t, Ranvier's nodes: b, 

 white substance of Schwann: d, cells of the endoneurium : a. axis-cylinder: x. myelin 

 drops ; 7, transverse section of nerve-fibre : S. nerve-fibre acted on with silver nitrate : I, 

 multipolar nerve-cell from spinal cord : z, axial cylinder process : y. protoplasmic processes 

 to the right of it a bipolar cell : II, peripheral ganglionic cell, with a connective-tissue 

 capsule; III, ganglionic cell, with o, a spiral, and n, straight process ; m, sheath. 



