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University of California Publications in Anatomy [Vol. 2 



Fig. 39, Experiment I. This figure well demonstrates the shape and the posi- 

 tion of the two degenerated segments (vr^ and 1W2) of the external sagittal fiber 

 layer of the parietal lobe, that is, of the visual radiation. Both degenerated zones 

 occupy the perpendicular or vertical branch of the crescent-shaped external 

 sagittal layer (rvert), its superior (rlis) and inferior horizontal branches (rhi) 

 containing only a few scattered degenerated fibers. None of the afferent degen- 

 erated visual fibers deviates as yet toward the striate cortex though the calcarine 

 fissure (Fc) is fully developed (dotted intra cortical stripe in the latter indicates 

 the striate cortex) ; and none of the visual fibers turns toward the cortex covering 

 the lateral face of the hemisphere. Angular gyrus (GA), inferior parietal gyrus 

 (PI), superior parietal gyrus (PS). 



