DEGENERATIONS FROM LESIONS OF TEMPORAL CORTEX. 157 



Many of its fibres entered the optic thalamus (see d. 3, fig. 4), 

 and of these some were not traceable further. Others traversed 

 this body, and appeared near the surface at a sulcus external to 

 the anterior corpus quadrigeminum ^ (see fig. 4). Some of these 

 latter entered the anterior tubercle ; the remainder were con- 

 tinued backwards to enter the posterior tubercle of the corpora 

 quadrigemina. Still others were continued into the internal 



^5-_ 



dtf 



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

 posterior to fig. 6. 



d. 1, (/. 2, d. 3, d. 5, and d. 6, same as iu fig. 6. 



d. 4 and d. 7, degenerations in tapetum. 



d. S, degeneration extending into optic thahimus. 



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 side opposite 

 to the lesion. In my experiments this was not so, unless one 

 regards those in the posterior commissure as belonging to the 

 same system (vide infra). My observations under this heading 

 in the main therefore confirm and extend those of numerous 

 observers. In addition to the names already quoted, may be 



^ Cy. Royce, " Coutrib. to the Study of : I. Some of tlie Decussating Tracts of 

 the Mid- and Inter-brain ; II. of the Pyramidal System in the Mesenceph. and 

 Bulb," Phil. Trans., ser. B., vol. clxxxviii. pp. 218, 219. 



