270 STUDY OF BRAINS OF SIX EMINENT SCIENTISTS AND SCHOLARS. 



Fissures of the Frontal Lobe [Lateral Surface). The Frecentral Fissural Complex. — 

 The supercentral presents a form similar to its fellow on the left, hut is shorter. The 

 precentral is more distinct and does not dip into the sylvian cleft. 



The superfrontal can be traced for 4 cm. from its origin but cannot be distin- 

 guished in the intricate markings of the prefrontal regions. The orbitofrontal and 

 medifrontal fissures are more distinctly marked on this side. The subfrontal is well- 

 marked and anastomoses with the diagonal fissure. 



Mesal Surface. — The supercallosal fissure presents a very tortuous course and 

 gives off several vertical rami. A fairly long frontomarginal in the precallosal region 

 gives a well-marked appearance of the three-tier type. There is a fairly long rostral 

 fissure. The paracentral fissure is curved and sends off" several rami. 



Orbital Surface. — The arrangement of a transorbital fissure with longitudinal 

 rami gives an appearance of a postorbital gyre with several sagittally-directed pre- 

 orbital gyres. The mesorbital gyre is somewhat broader than its fellow on the left. 



Ghjres of the Frontal Lobe {Lateral Surface). — The precentral gyre is of regular con- 

 tour. The superfrontal gyre is quite broad, the medifrontal is complexly marked, 

 while the subfrontal is of smaller extent than that of the left side. 



The mesal surface of the superfrontal gyre is marked by numerous rami of the 

 supercallosal fissure. The callosal gyre is marked by numerous independent segments 

 and by several rami of the paracentral, 



Fissures of the Parietal and Occipital Lobes (Lateral Surface). The Postcentral Fissural 

 Complex. — It is by no means easy to identify all the segments of this complex. The post- 

 central is a small zygal segment while the subcentral is a more extensive fissure which 

 anastomoses with the parietal and episylvian fissui-es. There is a long transpostcentral. 



The parietal fissure pursues a very irregular course, anastomoses with the super- 

 temporal but is separated from the paroccipital by a slight vadum. The paroccipital 

 is irregularly zygal. There is a well-marked transparietal. 



Mesal Surface. — The precuneal fissure is a quadri-radiate zygal fissure. N umerous 

 independent pieces mark the precuneus, while the cuneal surface could not be examined. 



Gryres of the Parietal and Occipital Lobes [Lateral Surface). — The postcentral gyre 

 is of fair width but less intricately marked than that of the left. The parietal gyre is 

 likewise of simpler contour. The marginal and angular gyres, on the other hand, are 

 notable for their extent and rich fissuration. 



Fissures of the Temporal Lobe. — The supertemporal fissure pursues a tortuous 

 course and measures, to its junction with the parietal fissure, 14 cm., an unusual 

 length. Several meditemporal segments, each considerably branched, mark this sur- 

 face. The other fissures could not be thoroughly examined. 



