c m 



A B C 



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

 Retzius.) The entire cell is invested with the neurilemma. R R, nodes of Ranvier. 

 B, Portions of two nerve-fibres stained with osmic acid (from a young rabbit) ; diagrammatic, 

 425 diameters. (Schiifer.) R R, nodes of Ranvier, with axis - cylinder passing through ; 

 a, neurilemma ; c, nucleus and protoplasm lying between the neurilemma and the medullary 

 sheath. C, Medullated nerve-fibre treated with osmic acid. (Rey and Retzius.) E, node of 

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

 to form conico-cylindrical segments. 



