CHAP, ii.] 



THE BRAIN. 



767 



FIG. 134. DIAGRAM OP THE GYRI (CONVOLUTIONS) SULCI, (FISSURES ON THE 



LATERAL SURFACE OF THE RlGHT HEMISPHERE OF MAN. 



S S 0>1^_ foVn.ciaru^-^ V l c ^ e ^ $/ \C^ 



FIG. 135. THE SAME ON THE MESIAL SURFACE. (Gowers.) 



In both figures the sulci are indicated by italic and the convolutions by 

 roman type. 



The following list of some synonyms may perhaps be of use in connection 

 with these figures and those of the brain of the monkey, Figs. 123, 124. 



Gyri, or Convolutions. Precentral or anterior central = ascending frontal. 

 Postcentral or posterior central = ascending parietal. Superior temporal = infra- 

 marginal first temporal. Triangular lobule = cuneus. Central lobe = Island 

 of Reil. Paracentral lobule = the mesial face of the ascending frontal, within 

 the marginal gyrus. Cingulum = the part of the gyrus fornicatus which adjoins 

 the Corpus callosum. Gyrus Hippocampi = uncinate gyrus, though the latter 

 name is sometimes restricted to the front part of the hippocampal gyrus ; the two 

 may be considered as a continuation of the gyrus fornicatus, and the three 

 together, forming a series, have been called ' the great limbic lobe.' 



Sulci or Fissures. Central = Rolandic, or of Rolando. Perpendicular = 

 parieto-occipital. Parietal = intraparietal or sometimes interparietal. 



Temporo-sphenoidal lobe = temporal lobe. 



