THE BRAIN OF PREHISTORIC MAN 899 



complftt' fullness to Xhv iiontal aif in Homo sapiens. This apparent failure 

 of the Neanderthal Irontal li>l)e to attain its iiltnnate proportions not only 

 charaeterizes theortian Ironi a struetural |)oint ol \ie\\, hut must ha\-e had a 

 lar-reaehin^ mlluenee upon tlu' ethnical cultures and Imal destiny ol these 

 prmiit i\ t' Eiiropeans. 



1 111 S^'L\ lAX Fissure. The position ol the SyKian hssure is readily 

 idenlilu'd in its posterior dl\ ision extendinu Irom the tronto-tcniporal notch 

 beneath and caudal to the [)arietal emun'iiee. The arrangement ot its caudal 

 e\tremit\ is not discernible but its anterior and horizontal rami are clearly 

 deliiied. 



Tin: r^issL KE 01 Rolando. The lissure of Rolando may be introduced 

 on the basis ol the usual estimations lor this sulcus. Its exact position, length, 

 angle ol inclination, and terminations are mainly hypothetical since no actual 

 groove on the cast indicates the presence ol the (issure. 



The Transverse Sinus. The groove of the transxerse sinus is visible 

 and marks thednision l)t't\\t'en the cerebral hemisplnax's and the cerebellum. 



The Fronial Lobe. The frontal lobe as a whole bears i'\ Idence of 

 much expansion as shown by the broadening ot its pole and a tendency to 

 round out the arc, which gi\-es the identil\ing prominence to the modern 

 lorehead. 1 he process, ho\\e\er, iiuoKcs only the polar areas ol the lobe in 

 which the impi\-ssions ol the superior and middle Irontal comolutions are 

 apparent. In tin- rt-mainder ol the Irontal area there is no sign of lissures or 

 con\ olut ions. The exact allocation ol preei'iitral motor area or of the inter- 

 mediate precentral area for skilled mo\tinents cannot be made. The coronal 

 constriction is (|uite conspicuous. A large Pacchionian elevation is situated 

 near the superior longitudinal hssure in the line of the coronal suture. Upon 

 the right lu'inisphere the position ol the middle nuaiingeal arter\' is faintly 

 visible, while upon the lelt it is less distinct. The outstanding feature of the 

 frontal lobe is tlu' prominence ol the inferior frontal couNolution. This 



