. Anatomy, descriptive and applied. Anatomy. 858 THE NEB VE SYSTEM The plan of structure of the brain differs, tlierefore, from the comparatively sim 3le arrangement of the gray and white substance in the spinal cord. In the brain tlie gray substance is not centrally situated throughout, and there is a tendency to nuclear differentiation of great and small ganglionic masses. These are con- nected with each other and with the centres in the cord by longitudinal strands of fibres of greater and less length, as well as by transverse associating fibres RHOMBOIDAL. Fig. 629.—Three stages in the dev
. Anatomy, descriptive and applied. Anatomy. 858 THE NEB VE SYSTEM The plan of structure of the brain differs, tlierefore, from the comparatively sim 3le arrangement of the gray and white substance in the spinal cord. In the brain tlie gray substance is not centrally situated throughout, and there is a tendency to nuclear differentiation of great and small ganglionic masses. These are con- nected with each other and with the centres in the cord by longitudinal strands of fibres of greater and less length, as well as by transverse associating fibres RHOMBOIDAL. Fig. 629.—Three stages in the development of the medulla oblongata, showing the metamorphosis of the rhomboidal lip. (Modified after His.) uniting the bilateral nuclei of the same ganglionic category; with the periphery they gain connection through the cranial nerves and [via the spinal cord) the spinal nerves. In tracing the various structures of the brain from the medulla oblongata to the cerebral cortex we follow anatomically what nature has done in the evolution of the highest type of brain from that of the simplest and most ancient vertebrate. In the medulla oblongata lie the centres which exert a very direct influence over those of the entire cord. The striate bodies and the thalami form a connecting link between the higher cerebral cortex and the medulla oblongata and cord below. The extensive cerebral cortex, an aggregation of psychic centres and therefore the seat of the will, controls the activities of the fore-brain ganglia (corpus striatum, thalamus) and the cerebellar cortex, and these in turn preside over the functions. 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
