SPINAL CORD AS A PATH OF CONDUCTION. 171 



doubtless in the gray matter of the upper regions of the cord, but 

 most of them continue upward on the same side, enter the infe- 

 rior peduncle of the cerebellum (restiform body), and terminate 

 in the posterior and median portions of the vermiform lobe, 



J^e/ve 



Fig. 78. — To show the course of the fibers of the cerebellar tracts of the cord (Mott): 

 T.a.c, Ventral tract (superficial anterolateral); rf.a.c-., dorsal tract (cerebellospinal) ;_s.2)., supe- 

 rior vermis; P.C.Q., inferior colliculus. 



mainly on the same side, but partly also on the opposite side. 

 The superficial anterolateral fasciculus, situated ventrally to the 

 cerebellospmal fasciculus (gr, Fig. 75), may extend forward into 

 the anterior funicuh along the periphery of the cord. The two 

 bundles may be more or less intermingled at the points of con- 

 tact. This tract begins in the lumbar region, its fibers arising 

 on the same side from tract cells situated in the intermediate 

 portions of the gray matter, or, according to Bruce,* in the lower 

 cells of the column of Clarke. This author states also that fibers 

 belonging to this tract in the lower thoracic region may pass 

 over into the tract of Flechsig at higher levels. Many of the fibers in 

 this tract possibly terminate in the cord itself, since the bundle does 

 not increase regularly in size as it passes up the cord. Most of the 

 bundle continues forward, however, along the ventral side of the 

 pons, gradually shifts more to the dorsal side, and at the level of the 

 superior peduncles of the cerebellum turns backward, for the most 

 part, at least, and passes to the cerebellum by way of the superior 

 peduncle (brachium conjunctivum) and the anterior medullary 

 velum, to end in the vermiform lobe chiefly on the same side, but to 

 some extent on the opposite sidef (Fig. 78). The area of dis- 

 tribution of these fibers lies anterior or headward of those arising 



* Bruce, "Quarterly Journal of Exp. Physiology," 3, 391, 1910. 

 t For the literature upon these tracts see Van Gehuchten, "Le Nevraxe," 

 3, 1.57, 1901; Horsley and Macnalty, "Brain," 1909, 237, and Bruce, Loc. ciL 



