A Study of Cerebral Anthropology 57 



Parieto-Occipital Region 



The sulcus interpartetalis complex, as on the left side, may be 

 represented by type I of the text (page 33) ; the similarity is 

 more however than a junction of the three principal fissures. The 

 anterior and posterior rami of the sulcus interparietalis are 

 separated, as on the left, the sulcus lateralis is present but on this 

 side is in anastomosis with the ramus ascendens sulcus tempo- 

 ralis superior. A secondary superior parietal fissure joins the 

 posterior end of the proximal segment of the sulcus interparie- 

 talis, giving it the appearance of extending to the mesial border. 

 The posterior ramus and sulcus occipitalis transversus are like 

 the left side. The complexity of the remaining fissures of the 

 occipital region makes interpretation difficult. There is no typical 

 representative of the sulcus lunatus. The sulcus occipitalis in- 

 ferior is present and well developed. 



The sulcus temporalis superior is somewhat more regular than 

 the left. It forms a continuous fissure and is confluent with the 

 anterior portion of the interparietal fissure, and also superficially 

 with the fissures of the lower occipital region. The gyrus tempo- 

 ralis superior is better developed than the one on the left, but at 

 the expense of the remainder of the lobe ; for the two temporal 

 lobes are very similar in shape and size. 



The sulcus temporalis medius is represented by two nearly con- 

 nected segments which run in a direction almost parallel to the 

 superior fissure and so the lobe has the appearance of a much 

 simpler arrangement and better development than the other side. 



Mesial and Inferior Surfaces 

 The mesial surface of the right hemisphere is not as simply 

 arranged as on the left side. The sulcus rostralis is deep and well 

 developed. It communicates through the sulcus transversus with 

 the anterior part of the sulcus cinguli. The stdcus cinguli is 

 represented by three separate segments. The sulci of the prae- 

 cuneus are of the same pattern as on the opposite side except for 

 the fact that they present confluence. The sulci subparietales are 

 confluent with the pars posterior sulcus cinguli, and the sulcus 



401 



