OCR Text |
Show 72 MR. F. E. BEDDARD ON THE [Feb. 7, the antero-posterior diameter of the hemisphere. In the Oxford brain it was most patent, without any measurements at all, that the fissure was much in front of the middle line. Tape measurement gave the total length of a hemisphere as 5 | inches and 2§ the length of the pre-Rolandic portion. This seems too great a difference to be accounted for by defective preservation resulting in unequal contraction. After two such divergent observations it seems to be difficult to deduce any conclusions which bear upon the relative sizes of the two lobes in question. There is evidently much variation. Fig. 6. Brain of Gorilla. Letters as in fig. 1. This fissure varies too in its length, sometimes cutting the mesial surface of the brain superiorly and reaching the Sylvian fissure below ; it is not always so long. In only one of the five brains at m y disposal (fig. 7) did the Rolandic sulcus actually cut the margin of the brain and disappear from view when the brain was examined from above; this, moreover, was only on the right side. In the other brains were exhibited |