Surgical anatomy : a treatise on human anatomy in its application to the practice of medicine and surgery . perforated space and the mainportion of the fissure of Sylvius. The apex is directed forward, and is formed bythe curving of the convolutions in i:)assing from the convex to the orbital sides are formed by the longitudinal fissure and the lower border of the hemi-sphere. On this surface are two secondary fissures, the olfactory and the orbital. The olfactory fissure runs parallel with the longitudinal fissure and a shortdistance external to it. It lodges the olfactory tract a
Surgical anatomy : a treatise on human anatomy in its application to the practice of medicine and surgery . perforated space and the mainportion of the fissure of Sylvius. The apex is directed forward, and is formed bythe curving of the convolutions in i:)assing from the convex to the orbital sides are formed by the longitudinal fissure and the lower border of the hemi-sphere. On this surface are two secondary fissures, the olfactory and the orbital. The olfactory fissure runs parallel with the longitudinal fissure and a shortdistance external to it. It lodges the olfactory tract and bulb. The orbital or triradiate fissure is situated about the middle of the portionof this surface, which lies external to the olfactory fissure. It consists of a mainportion, which is directed forward and runs nearly parallel with the olfactorj^ fis-sure, and of two branches, one directed backward and inw-ard, and the otheroutward. The gyrus rectus is situated between the olfactory and longitudinal fissures. PLATE CCLXX. Posterior orbital gyrusInternal t OlfactoGyrus rectus Anterior orbital gyrus. mmissure I Formatio reticularis at superior portion of pons Aqueduct of Sylvius UncusCrus cerebri INFERIOR SURFACE OF FRONTAL483 THE CICREBRUM. 485 It is continuous in front witii the su2)erior or first frontal convolution, and inter-nally with the marginal convolution. The internal, anterior, and posterior orbital gyri are located between thebranches of the triradiate fissure, and are named from their relation to thebranches of the fissure. They are continuous respective!) with the first, second,and third frontal convolutions. Inner surface of the frontal lobe.—Upon this surface are tertiary fissures, thechief of which runs for some distance parallel with the calloso-marginal fissure,and partly divides the convolution of this surface into two portions. Tlie marginal gyrus lies between the calloso-marginal fissure and the upperand anterior margin of the hemisphere of the cerebru
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