396 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



I. White matter. 



1. Transverse fibers (a) superficial, (ft) 

 deep (trapezium). 



2. Longitudinal fibers (a) superficial (an- 



terior pyramids), (fe) deep. 



3. Posterior longitudinal bundle. 



4. Fibers of fifth, sixth, seventh, and eighth 



cranial nerves. 



5. Formatio reticularis. 



6. Median raphe. 



7. Fillet mesial and lateral. 



II. Gray matter. 



1. Nucleus pontis. 



2. Superior olive. 



3. Nuclei the origin of fifth, sixth, seventh, 



and eighth cranial nerves. 



Transverse Fibers. The superficial and the deep- 

 set of transverse fibers of the pons pass into the cere- 

 bellum through the middle peduncle. Some of the 

 fibers are commissural between the two halves of the 

 cerebellum, while others connect with the nuclei 

 pontis on the same side or the opposite side. In the 

 lower portion of the pons, near the medulla, the deep- 

 set are called the trapezium, on account of their 

 trapezoid arrangement. 



Longitudinal Fibers. The superficial set repre- 

 sents mostly longitudinal bundles of the anterior 

 pyramids that interlace the transverse fibers. The 

 deep-set are near the dorsal aspect of the pons and 

 comprise at least three groups: (i) the posterior 

 longitudinal bundle near the median raphe in which 



