. The American journal of anatomy. doubtas to how to designate each segment. The appearance is one of duplica-tion similar to that observed hitherto by Manouvrier and others. The paracentral is simple, sweeping caudad gradually to appear on thedorsal surface for 12 mm. Cephalad it joins a segment of the supercal-losal. There is an independent longitudinal intraparacentral. The inflected is absent. Both the rostral and subrostral fissures are well marked; the former cm. in length, the latter cm. Orbital Surface.—On the orbital surface, the fissures are is a lateral trira
. The American journal of anatomy. doubtas to how to designate each segment. The appearance is one of duplica-tion similar to that observed hitherto by Manouvrier and others. The paracentral is simple, sweeping caudad gradually to appear on thedorsal surface for 12 mm. Cephalad it joins a segment of the supercal-losal. There is an independent longitudinal intraparacentral. The inflected is absent. Both the rostral and subrostral fissures are well marked; the former cm. in length, the latter cm. Orbital Surface.—On the orbital surface, the fissures are is a lateral triradiate fissure, whose caudal limbs correspond withWeisbachs transverse orbital, and mesad of this lie a zygal and onesagittal fissure. The last-mentioned anastomoses with the orbitofrontalover a vadum. The olfactory fissure is cm. in length. Gyres of the Frontal Lobe (Lateral Surface).—The precentral gyre,in general, is much wider than the postcentral gyre, but is unusually tor-tuous, and indented by numerous fissural Fig. 10. Braiu of Nuoktali; veutral view. Edward Anthony Spitzka 49 The superfrontal gyre is especially broad in the prefrontal region, andmore or less regularly divided into two longitudinal tiers by two para-mesial fissural segments. Between these two are a triradiate and also azygal segment; still further cephalad there are nu-merous transverse tri-radiate and zygal j)ieces Avhich make this portion of the gyre of an ex-ceedingl} complex configuration. The medifrontal gyre is massive, tortuous and distinctly divided intotwo tiers by a long medifrontal fissure. The subfrontal gyre, while small, is well convoluted, and in general ex-hibits most strikingly the tendencj^ of fissures and ramifications toassume a transverse direction. Mesial Surface.—The mesial surface of the superfrontal gyre is broadand traversed by a large number of radiating fissures and rami. Thedorsi-mesal margin is particularly marked by numerous fissural segments. The paracentr
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
