. Anatomy, descriptive and applied. Anatomy. THE CEREBRAL IIEAIISPIIERES 951 the thalamus, enter the internal capsule to pass toward the cortex, in part through the lenticular nucleus, in part in the sublenticular zone, to form the ansa lenticu- laris. The reenforcement of this sublenticular white-fibre tract by cortico- thalamic fibres from the temporal lobe to thalamus forms the ansa peduncularis. The topographic relations of the various tract masses as seen in a flatwise section is schematically shown in Fig. 713; on the whole, they cori'espond to the cortical areas with which they are conn
. Anatomy, descriptive and applied. Anatomy. THE CEREBRAL IIEAIISPIIERES 951 the thalamus, enter the internal capsule to pass toward the cortex, in part through the lenticular nucleus, in part in the sublenticular zone, to form the ansa lenticu- laris. The reenforcement of this sublenticular white-fibre tract by cortico- thalamic fibres from the temporal lobe to thalamus forms the ansa peduncularis. The topographic relations of the various tract masses as seen in a flatwise section is schematically shown in Fig. 713; on the whole, they cori'espond to the cortical areas with which they are Fig. 713.—The motor tract. (Modified from Poirier.) The external capsule (Fig. 711) is a thin lamina of white substance interposed between the ectal face of the lenticular nucleus and the claustrum. Dorsally, frontad and caudad, at the corresponding borders of the lenticular nucleus, it joins the internal capsule mass, while ventrally it is continuous with the white centrum of the temporal lobe. Its comparatively few projection fibres course to and from the ventral parts of the thalamus; its chief constituents are associa- tion axones for the circuminsular cortical areas. Minute Structure of the Cerebral Cortex and its Special Types in Different Regions (Fig. 714).—A section of the cerebral cortex reveals a tendency on the part of its constituent cells to arrange themselves in layers which alternate with zones less rich in cellular elements. Among the cells course the axones arising from them or terminating in their neighborhood. The axones are chiefly amyelinic, though some are myelinic for a part of their intracortical. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gray, Henry, 1825-1861; Spitzka, Edward Anthony, 1876-1922. Philadelphia, New York, Lea & Febiger
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
