THE PONS FINAL REVIEW. 221 



side. From these nuclei arise the nerve. (Compare Figs. 47, 

 108, 110, 114, 115, 116, ami 132.) 



3. The motor speech-tract. We possess certain knowledge 

 of only a few points along this tract, the point of origin in 

 the lower frontal convolution, the terminal point in the nuclei 

 of the facial and hypoglossal, and, between the two, a point out- 

 side the tail of the nucleus caudatus. Apparently (Wernicke) 

 the tract passes somewhat toward the median line from Broca's 

 convolution third frontal and pursues an almost horizontal 

 course under the island, dorsad of the internal capsule. Its 

 fihrcs then pass into the internal capsule behind the motor tracts, 

 and from there run to the crusta. In the pons they must 

 gradually pass up into the tegmentum. Disturbances of speech 

 have been observed in disease of all the above-mentioned points. 

 (See Figs. 27 and 28.) 



4. The coronal fibres to the pons arise from the cortex of 

 the fore-brain, particularly 'from the frontal and parieto-occipital 

 lobes. They pass through the internal capsule into the crusta, 

 and from there into the pons (Fig. 56). From here they pass 

 either directly or through interpolated ganglion-cells into the 

 middle peduncles of the cerebellum, or brachia pontis. 



5. The tegmental radiation arises in the parietal lobe, pos- 

 sibly in the same regions as the pyramidal fibres, and passes into 

 the posterior third of the internal capsule. In this situation it 

 is very closely approached by the optic radiation from the oc- 

 cipital lobe, and by the central tract of the acoustic. (As 

 regards the latter tract, this has been demonstrated clinically, 

 but not anatomically). A part of the tegmental tract passes 

 into and through the lenticular nucleus, and a part passes 

 directly into the fillet. Probably these two portions become 

 united on the median side of the body of Luy's, upper fillet. 

 (Compare Figs. 47, 51, 52, 54, 56, and 59.) 



6. The largest part of the fillet arises from the deep marrow 

 of the corpora quadrigemina and from the nucleus of the pos- 

 terior qiutylrigeminal body. In all likelihood it represents the 



