1.32 THE BRAIN OF THE TIGER SALAMANDER 



cells of the anterior nucleus are scattered among similar cells of the 

 tegmentum near the level of exit from the brain. The posterior nu- 

 cleus is farther spinalward and is the anterior part of a well-defined 

 column of cells, which also includes the motor IX and X nuclei. The 

 motor VII root fibers pass forward dorsally of the f. longitudinalis 

 medialis (fig. 89) and turn laterally to emerge from the brain, as in 

 Necturus ('30, p. 15). There is no visible boundary between the 

 posterior motor VII and the motor IX and X nuclei. 



