THE BRAIN OF MODERN AlAN 



781 



zontal braiK'h lurms tlu' jiurs orhitulis, ov tlic orbital ()|ie'iculuni ; llic poilioii 

 of the coiuoliilion brtwci-n the anterior and ascciiclm^ branches lornis the 

 purs triaui^uluris, or intirmediate bontal opercLdnm; eauchil to the ascending 



FIG. 337B. DETAILED DIAGKAM Ul UOKSAL SURFACE OF BRAIN, IIUMO SAPIENS. 

 Key TO Diagram, sllc. intekpar., Sulcus Interparietalis; sulc. occip., Sulcus Occipitalis; i. par. occ. 

 MD., Fissura Pariito-occipitalis Medialis; suix. precnt. int.. Sulcus Precentralis Inferior; SULC. precnt. 

 SUP., Sulcus Precentralis Superior; sui.c. ketroc. inf., Sulcus Rctroccntralis Inferior; sulc. ret. sup.. Sulcus 

 Rctrocentralis Superior. 



branch of the SyKian hssure is located the ])urs hasalis. All of these divisions 

 of the Sylvian hssure and the art-as upon the cerel)ral cortex which are 

 demarcated by them are poorly delined in the great apes. The chief differ- 



