120 JJniversity of CaUfornia PuUications in Anatomy [^^f>'^- 2 



the cortex bordering the striate area belonging to the area peri- 

 parastriata of Elliot Smith or fields 18 and 19 of Brodmann. The 

 same was observed in sections where the striate cortex extends upon 

 the free face of the hemisphere along the ascending branch of the 

 calcarine fissure Fc (upper degenerated bundle in fig. 74, see also 

 lower figure in fig. 3 and compare it with fig. 7). The boundary of 

 the cortical segment which in this experiment receives afferent visual 

 fibers and the medial boundary of the striate area of the upper lip of the 

 fissura calcarina are consequently congruent and identical. Figures 

 69, 71-74 also demonstrate the course of the degenerated visual fiber 

 bundle which while still in the white substance keeps close to the striate 

 cortex, leaving the remaining portion of the white substance along the 

 non-striate cortex entirely free. 



The shape of the segment of the striate cortex supplied in the pres- 

 ent experiment by the fibers of the single degenerated bundle of the 

 visual radiation resembles that of a narrow triangle stretching along 

 the upper lip of the main undivided horizontal branch of the fissura 

 calcarina (Fcalc) and in the anterior lip of the ascending branch of 

 that fissure (lower figure in fig. 3, shaded area; compare with fig. 7). 

 This cortical segment, as could be expected, is identical with a similar 

 segment delimited in Experiment II (lower figure in fig. 2). In 

 Experiment III, as in other experiments, the shaded area in figure 3 

 along the main horizontal branch of the fissura calcarina indicates 

 merely the longitudinal extent of the supplied cortical segment, this 

 segment emerging on the free internal face of the hemisphere only 

 along the ascending branch of the fissure. 



Finally special emphasis must be laid upon the fact that no degen- 

 erated visual fibers were seen, in the present experiment, to reach any 

 portion of the parieto-occipital cortical region covering the inner and 

 outer face of the hemisphere which does not belong to the striate 

 cortex. But likewise no degenerated fibers enter any other portion of 

 the striate area itself (lower lip of the calcarine fissure, occipital oper- 

 culum, occipital pole) except the described segment in the upper lip 

 and in front of the ascending branch of the calcarine fissure. Also no 

 visual fibers were seen entering the corpus callosum in order to reach 

 the opposite hemisphere. 



