252 STUDY OF BRAINS OF SIX EMINENT SCIENTISTS AND SCHOLARS. 



its caudal termination is simple, there being no sharp turn in passing into the epi- 

 sylvian. There is a short hyposylvian. The length of the sylvian proper, between 

 the presylvian and its junction with the epi- and hyposylvian rami is 4.2 cm. The 

 pres3dvian is simple, 1.8 cm. in length; the subsylvian, 2 cm. in length, anastomoses 

 with the radiate. Tlae episylvian appears as the direct continuation of the sylvian, 

 though an examination of its depths shows it to spring from the caudal angle of the 

 circuminsular fissure. Its length is 2.6 cm. The hyposylvian ramus is a trifle over 1 

 cm. in length. 



The Central Fissure. — The central fissure, 10 cm. in length, pursues a much 

 straighter course than on the left side. It anastomoses with the supercentral. In its 

 general direction it makes an angle of 62° with the intercerebral cleft. 



The Occipital Fissure. — Its length on the meson is 2.8 cm., on the dorsum 2 cm. 

 At a point 1.7 cm. from the occipito-calcarine junction, the fissure is joined by an 

 adoccipital of lesser extent than on the left half, but giving a similar appearance of 

 "bifurcation" of the occipital. The fissure makes an angle of about 52° with our 

 horizontal plane. 



The Calcarine Fissure. — The calcarine fissure springs from its junction with the 

 occipital almost as if a continuation of the latter, so that the angle of the cuneus is 

 exceedingly obtuse (150°). The fissure then sweeps caudad in a sinuous manner for . 

 5.7 cm., terminating at the occipital pole. A cuneal fissure joins it in its caudal third. 

 The occipito-calcarine stem is 3.8 cm. in length. 



Fissures of the Frontal Lobe (Lateral Surface). The Precentral Fissural 

 Complex. — The supercentral is a tri-radiate fissure whose cephalic arm is continuous 

 with the superfrontal. The ventral ramus joins the central. The precentral is of 

 zygal shape, the dorso-cephalic ramus being continuous with the medifrontal. The 

 transprecentral, springing from the sylviai:i cleft, but otherwise independent, is 1.5 cm. 

 in length. 



The diagonal, 3.5 cm. in length, lies just cephalad of the precentral, is super- 

 ficially confluent with the sylvian and anastomoses cephalad with the subfrontal. 

 The superfrontal is a tortuous fissure, passing well cephalad without interruption with 

 a length 9 cm. The medifrontal is exceedingly well marked. Springing from the 

 precentral it pui'sues a very tortuous course, sending ofl^ a number of rami, and ter- 

 minating in a bifurcation, the lateral limb anastomosing with the orbitofrontal. Its 

 total length is 7 cm. The subfrontal is a more extensive fissure than that of the left 

 side. It anastomoses with both the diagonal and the orbitofrontal. 



The orbitofrontal is a very tortuous combination of segments. It anastomoses 

 with the subfrontal and medifrontal fissures, and reaches to the mesial border. Its 



