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H. W. NORRIS AND SALLY P. HUGHES 



lear nidulus dorsal to the ventral motor fiber columns immediately 

 posterior to the oculomotor nidulus (figs. 12 to 14, 18, and 19). 

 Near the decussation the trochlear fibers pass by and interlace 

 with the fibers of the radix mesencephalica V, which here con- 

 sists of numerous small tracts near their termination in the mesen- 



cephalic tectum. Peripherally, the nerve runs anteriorly along 

 the dorsolateral border of the midbrain, in the anterior part of 

 its intracranial course pressed closely between the brain and the 

 skull. At its foramen it passes ventrolaterally through the 

 cranial wall and comes into intimate relation with the mesial 

 border of the ramus ophthalmicus superficialis facialis. Thence 



