156 



THE NERVOUS SYSTEM 



(Fig. 112). Near the rostral border of the pons it assumes a crescentic outline 

 and lies in the lateral part of the reticular formation. From its ventral border 



Fig. 111. Diagram of the nuclei and central connections of the trigeminal nerve: A, Semi- 

 lunar ganglion; B, mesencephalic nucleus, N. V.; C, motor nucleus, N. V.; D, motor nucleus, N. 

 VII; E, motor nucleus, N. XII; F, nucleus of the spinal tract of N. V; G, sensory fibers of the sec- 

 ond order of the trigeminal path ; a, ascending and b, descending branches of the sensory fibers, 

 N. V; c, ophthalmic nerve; d, maxillary nerve; e, mandibular nerve. (Cajal.) 



fibers stream across the median plane, decussating with similar fibers from the 

 opposite side. This is the most caudal portion of the decussation of the brachium 



