Thompson — Degenerations from Lesions of Temporal Lobe. 191 



tubercle of the corpora quadrigeroina. Still others were continued into 

 the internal geniculate body. These are probably identical with the 

 similar fibres found by Boyce after removal of one hemisphere. 

 Boyce considers, however, that they end chiefly on the opposite side. 

 In my experiments this was not so, unless one regards these in the 

 posterior commissure as belonging to the same system (vide infra). 

 My observations therefore confirm those of numerous observers. In 

 addition to the names ah'eady quoted, may be mentioned those of 

 Bejerine,^ and of Ferrier and Turner,^ whose publications have- 

 appeared since the present research was ujidertaken. 



as 



Fig. 7. — Vertical section through same brain as figs. 5 and 6 but posterior 

 to fig. 6: — 



d. 1., d. 2., d. 3., d. 5, and d. 6. same as in fig. 6. 



d. U. and d. 7. degenerations in tapetiim. 



d. 8. degeneration extending into optic thalamus. 



It is interestiug to note, at this stage, the existence of degenerated 

 fibres in the posterior commissure (see d. 5. figure 8). These 

 turned immediately downwards towards the dorsal grey nuclei of the 



^ Bejerine, J., " Sur I'origine cert, et trajet intra-cereb. des fibres de I'etage inf. 

 on pied du pedoncle cerebrale." Mem. de la Soc. de Biol. t. 5, p. 193-206. 



2 Ferrier and Turner, W.A., " An expeiim. Research upon Cerebro- cortical 

 afferent and efferent Tracts," Pro. Eoy. Soc, Ixxii., p. 1. 



