382 



THE EXTERNAL CONFIGURATION 



but, so far as I am aware, is not present in any adult 

 quadrumanous brain. The defect in the frontal lobe 

 explains the remarkable constricted form of the Bush- 

 woman's brain, already mentioned as existing at that 

 point, a form which we may perhaps assume is a charac- 

 teristic of the Bosjes brain, as it is equally present in the 

 brain of the so-called Hottentot Venus, where it has also 

 been noticed by Gratiolet as a foetal character." 



Par, 



FIG. 137. Right Cerebral Hemisphere of a Scotchman, outer aspect. (Turner.) 

 Fr, Fr, Frontal lobe; Par, parietal lobe; Oc, occipital lobe; T S, temporo-sphen- 

 oidal or temporal lobe ; S, S, Sylvian fissure ; 'S, 'S, ascending limb of Sylvian fissure 

 (or ' Sulcus precentralis ' of Ecker) ; R, E, fissure of Rolando ; IP, intra-parietal, 

 and P, P, parallel fissures. 1, 1, 1, Inferior, 2, 2, 2, middle, and 3, 3, 3, superior 

 frontal convolutions ; 4, 4, ascending frontal, and 5, 5, ascending parietal convohi- 

 tions ; 5', outer part of postero-parietal lobule ; 6, 6, angular gyrus ; 7, 7, superior, 

 8, 8, 8, middle, and 9, 9, 9, inferior temporal convolutions ; 10, superior, 11, middle, 

 and 12, inferior occipital convolutions ; A, supra- marginal lobule ; a, /S, y, S, first, 

 second, third, and fourth annectent or bridging convolutions. 



The fissure of Rolando (fig. 136, d, d) commences about 

 1 J inches behind the tip of the temporal lobe. " It ter- 

 minates considerably beyond the middle of the long axis 

 of the cerebrum, nearly as far back as the line of greatest 

 width of that organ ; so that it passes proportionally 

 further back than in the Hottentot Venus, or indeed than 

 in the European." 



