314 THE INTERMEDIATE PRIMATES 



Lateral to the dorsal nueleus of the pneumogastrie nerve is a compact 

 oval bundle constituting the fasciculus solitarius (Nfs). Some entering 

 fibers of the pneumogastrie nerve are seen approaching the fasciculus 

 solitarius. This nucleus belongs to the communis system. It conveys descend- 

 ing fibers, ultimately entering into relation with the nucleus of the fasciculus 

 solitarius which is connected with the sense of taste. It also receives fibers 

 from the glossopharyngeal nerve, supplying the tongue, and a large contin- 

 gent from the pars intermedia of Wrisberg connected with the facial nerve. 

 1st phyletic constancy in the primates seems to argue that the sense of taste 

 undergoes but little material alteration throughout this order of vertebrates. 

 Lateral to the central gray matter, but separated by a narrow strand 

 of fibers, is the cephalic remnant of the nucleus of Goll (^NG), which at 

 this level is much attenuated. In a more lateral position is the nucleus <if 

 Burdach (NB). Ventral to the nucleus of Burdach is the substantia gelati- 

 nosa (NR) surrounded on its external surface by the dense bundle of the 

 descending trigeminal tract (Trd). Occupying a peripheral position in the 

 dorsolateral aspect of the oblongata is a bundle of fibers which has been 

 assembled from several sources and consists of axons, all of which are destined 

 to enter the cerebellum. This structure is the restiform body or inferior cere- 

 bellar peduncle (TCP). The griseal portion of the reticular formation ( Ref ) 

 lies ventral to the central gray matter (Cen) and is penetrated by many 

 arcuate fibers, most of which have their origin in the nucleus of Burdach 

 (NB). These arcuate fibers pass forward and inward from the median line 

 to decussate in the raphe and ascend as part of the mesial fillet (Mf). 

 Some of these arcuate fibers pass through the inferior olivary nucleus. 

 Immediately adjacent to the median raphe and ventral to the central gray- 

 matter is the posterior longitudinal fasciculus (PL) in front of which lies 

 the collected mass of the ascending axons constituting the mesial fillet 

 (Mf), while the dense bundles of axons comprising the pyramid (Py) lie 



