ON VOLUNTARY MOVEMENTS. 



677 



especially in young persons, has been followed by recovery, but in such 

 cases it has been supposed that the dormant area on the right side has been 

 awakened to activity by the loss of the left area ; and in support of this 



FIG. 152. 



JPar.Oc.F. 



LOBE 



TEMPORAL 



Diagram of the Gyri (convolutions) and Sulci (fissures) on the Lateral Surface of the Right 

 Hemisphere of Man. (Gowers.) 



FIG. 153. 



F.Rolando 



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. 149 and 150). 



Gyri or convolutions. Precentral or anterior central = ascending frontal. Postcentral or pos- 

 terior central = ascending parietal. Superior temporal = infra-marginal = first temporal. Tri- 

 angular lobule = cuneus. Central lobe = island of Reil. Paracentral lobule = the mesial face 

 of the superior 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 fissuers. Central = Rolandic, or of Rolando. Perpendicular ptari eto-occipital. 

 Parietal = mtra-parietal or sometimes inter-parietal. Tempor=o-sphenoidal lobe =mporal lobe. 



view cases have been recorded in which a first aphasia, due to a lesion on 

 the left side has been followed by a second aphasia due to a subsequent lesion 



