LONGITUDINAL FIBERS OF PONS. 



277 



part of the pons (Figs. 87 and 88). In the center of the gray 

 crescent of the spinal cord the rubro-spinal tract ends. Its func- 

 tion is unknown, perhaps it has to do with locomotion (Horshy). 

 (8) The olivary bundle (fasciculus olivaris} is regarded by 

 many as an ascending tract, but the weight of evidence at present 

 'is in favor of a descending course. Rising in the lentiform nucleus 

 and descending through the mid-brain, it enters the center of the 



Nucleus globosus 

 Nucleus emboliformis 



Hilus of nuc. dentatus 

 Nuc. of becht 

 Nuclei of sth nerve 



Colliculus facialis 

 Nucleus fastigii 



Nucleus of abducent n. 



Medial longitudinal 

 bundle 



Tractus spinalis N. trigemini 



Superior olivary nucleus 



Trapezoid body and medial fillet 



Nucleus of facial n. 

 ormatio reticularis 



Transverse fibers to brachium pontis 

 Pyramidal tract 



Fig. 88. Inferior section of the pons together with the cerebellum. (Original.) 



reticular formation of the pons, hence the name, central tegmental 

 tract (Fig. 88). It runs dorsal to the medial fillet and the corpus 

 trapezoideum in the lower part of the pons, just medial to the 

 superior olivary nucleus. It terminates in the inferior olive. 



(9) The descending root of the trigeminal nerve (Fig. 87) 

 is crescentic in section and runs between the ventricular gray 

 substance and the brachium conjunctivum of the cerebellum down 

 to the middle of the pons, where it joins the principle motor root. 

 It passes lateral to the motor nucleus situated under the locus 



