1 68 



THE FROG 



polar ") nerve-cells (Figs. 48 and 54, A), each continuous 

 with a neuraxis and enclosed in a tissue formed partly 



FIG. 54. A, nerve-cell from the grey matter of the spinal cord of a frog, and the 



nerve-fibre arising from it ; B, cell from the ganglion of a dorsal root. 

 ne. neurilemma ; nu. nucleus ; {nx. neuraxis ; m. s. medullary sheath. (After 

 Howes.) 



of the axis-fibres of nerves which enter the grey from the 

 white matter, losing their medullary sheath as they do so, 



