-13 



mm 



, j 



R 



B 



II 



c 



FIG. 115. A, Bipolar nei ve-cell with poles prolonged into medullated nerve-fibres. (Rey and 

 Retzius.) The cut in' cell is invested with the neurilemma. li R, nodes of Ranvier. 

 B, Portions of two nerve-tibres stained with osinic acid (from a yonm; rabbit); diagrammatic, 

 425 diameters. (Schafer.) R R, nodes of Ranvie.r, with axis : cylinder passing through ; 

 a, neurilemma ; c, nucleus and ]irotoplasm lying between the neuiilemma and the medullary 

 sheath. C, Mednllated nei vr-liln i- treated with osmic acid. (Rey and Retzius.) E, node of 

 Ranvier ; K, nucleus. The myelin of the medullary sheath is incompletely interrupted so as 

 to form conico-cylindrical segments. 



