. Cunningham's Text-book of anatomy. Anatomy. 660 THE NEKVOUS SYSTEM. limitans ; whereas the stria extends throughout both walls of the posterior calcarine sulcus, and in most cases beyond its lips on to the surface of the cuneus and the gyrus lingualis (Figs. 588 and 589), the exposed cortical areas placed upon the superior and inferior aspects respectively of the sulcus calcarinus posterior. Alono- the superior and inferior boundary lines of this area shallow limiting sulci usually develop (Fig. 589), and these furrows often pass posteriorly into little arched sulci polares, which are furrow
. Cunningham's Text-book of anatomy. Anatomy. 660 THE NEKVOUS SYSTEM. limitans ; whereas the stria extends throughout both walls of the posterior calcarine sulcus, and in most cases beyond its lips on to the surface of the cuneus and the gyrus lingualis (Figs. 588 and 589), the exposed cortical areas placed upon the superior and inferior aspects respectively of the sulcus calcarinus posterior. Alono- the superior and inferior boundary lines of this area shallow limiting sulci usually develop (Fig. 589), and these furrows often pass posteriorly into little arched sulci polares, which are furrows of the operculated variety (see p. 646), called into existence by the broadening out of the area striata (not an actual broadening, but an unfolding) as it passes round the edge of the hemisphere. At the point of transition from the deep sulcus calcarinus into the shallower sulcus calcarinus posterior (Fig. 588) a submerged ridge is usually found—the gyrus cuneolingualis anterior; and other similar ridges, which may be exposed on the Parieto-occipital fossa Incisura parieto-occipitalis .« Cuneus Anterior cuneo- lingual gyrus Sulcus calcariuus posterior Posterior cuneo- lingual gyrus. Gyrus cinguli Corpus callosum Thalamus —Gyrus cunei Sulcus calcarinus Gyrus lingualis Sulcus lingualis inferior Fig. 588.—The Parieto-occipital and the Calcarine Sulci fully opened up, so as to show the deep transitional gyri marking off the several elements of the -<-shaped system. Area striata, uniform hlue ; area parastriata, large blue spots ; area peristriata, fine blue dots. surface or may be submerged, are often found interrupting the posterior and lateral calcarine sulci themselves (Fig. 588). The posterior and lateral calcarine sulci are subject to a very wide range of variation in form, but they are always axial foldings of the area striata. When the area striata crosses on to the lateral surface of the hemisphere a small semilunar furrow develops a short distance in front of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
