Johnston, The Radix Mesencephalica Trigemini. 625 



the right (Fig. 22), since that section is somewhat further caudal 

 than the left-hand one. Many fibers of the sensory root enter the 

 chief sensory nucleus and the cephalic end of the substantia gela- 



V 



Fig. 21. Human foetus, 42 cm. Transverse section through the trigeminal 

 roots on the left side. The short heavy line at the left below is the outer 

 surface of the pons, x, x, x indicate the ends of the motor bundles, where they 

 leave the section. All the fibers below and to the left from these are sensory. 

 X20. 



tinosa. In each section is seen a large bundle of sensory fibers pass- 

 ing dorsad over the outer surface of the sensory nucleus. A part of 

 the fibers enter that nucleus, the remainder seem to pass on to the 

 cerebellum. 



