-8 



A3 



VTSU' 



(Facing Page 463.) 



Fig. 147. DIAGRAM OF THE VISUAL PATHS. (Modified from Vialet.) 

 OP. N, optic nerve; OP. C, optic commissure; OP. T, optic tract; OP. R, optic radia- 

 tions; V. S, visual speech center; A. S, auditory speech center; M. S, motor speech cen- 

 ter. A lesion or section at 1 causes blindness of that eye; at 2, blindness of the outer half 

 of each eye ; at 3, blindness of the nasal half of that eye ; similar lesions at 3 and 3', blind- 

 ness of nasal halves of both retinas; at 4, blindness of nasal half of one eye and temporal 

 half of opposite eye; at 8, on left side, word blindness 



