54 C. W. M. Poynter 



The sulcus frontalis medius is represented by two unimportant 

 seginents, the anterior one is connected superficially with the sul- 

 cus frontalis superior. The sulcus frontalis inferior is a simple 

 deep sulcus independent of connections and without deep annec- 

 tants. It is possible that at its anterior end one of the segments of 

 the sulcus f ronto-marginalis is represented ; the other two seg- 

 ments of this sulcus are separate and above; one is connected with 

 the middle frontal fissure. 



Parieto-Occipital Region 



The sulcus rctrocentralis inferior and sulcus refrocentralis 

 superior may, on account of their intimate connection, be con- 

 sidered as one sulcus. Below it is connected directly and deeply 

 with the fissura Sylvii, and not through the sulcus subcentralis 

 posterior, which is present immediately in front of this connection. 

 The upper termination is some distance from the border of the 

 hemisphere, consequenty the superior is much less fully developed 

 than the lower. 



The sulcus interparietalis is made up of two segments; the 

 anterior is connected with the sulcus rctrocentralis, so conforming 

 to type I (page 33 of the text). The posterior segment is con- 

 nected with the sulcus transversus. This is a conventional ar- 

 rangement except for the fact that both the parietal and occipital 

 rami are well developed and extend past each other, the occipital 

 being superiorly placed. A deep sulcus interparietalis lateralis 

 descends to clearly bound the gyrus marginalis. Sulcus trans- 

 versus runs inward almost to the mesial border and outward with- 

 out a confluence. The sulcus temporalis superior is very tortuous. 

 It encroaches so much on the superior temporal g>Tus that the 

 latter has the appearance of inferior development. It has seemed 

 to me that the sulcus is made up of three segments, the anterior 

 and middle joined superficially and confluent posteriorly with the 

 sulcus occipitalis lateralis while the third segment, the ramus 

 ascendens, stands independently. Sulcus temporalis medius is 

 represented by three irregular segments, the posterior connected 

 with the sulcus occipitalis inferior, which is well defined. 



398 



