. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. PERIPHEEAL-NERVE EOOTS^ SPINAL GANGLIA, SPINAL COED. 345 is ground for the assumption that these pyramidal tracts contain the majority of the fibers extending from the brain to the cord, which subtend acquired movement. They degenerate only downward; their fibers dis- appear regularl}^, if the tract be destroyed anywhere in the brain or the cord. In the area of the lateral columns, occupied partly by the tradus cortico- spinalis, there are to be found other fibers, which, bel
. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. PERIPHEEAL-NERVE EOOTS^ SPINAL GANGLIA, SPINAL COED. 345 is ground for the assumption that these pyramidal tracts contain the majority of the fibers extending from the brain to the cord, which subtend acquired movement. They degenerate only downward; their fibers dis- appear regularl}^, if the tract be destroyed anywhere in the brain or the cord. In the area of the lateral columns, occupied partly by the tradus cortico- spinalis, there are to be found other fibers, which, belonging to the associa- tion-bundles of the cord, join its different levels together. The longest fibers. Fig. 221.—Scheme of the descending degeneration in the tractus cortico-spinalis in a case of focal lesion in the left internal capsule. of this category are in this territory. So it happens, in case of lesion of the lateral column of the cord, that a larger area degenerates downward than accords with the spread of the pyramids in the medulla oblongata. From this circumstance has arisen the common error of supposing that the pyra- mids receive fibers from the cord itself. At birth all the tracts of the cord, in man, have received their medul- lary sheaths. Only the tractus cortico-spinales form exceptions. "With the. 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 Edinger, Ludwig, 1855-1918; Hall, Winfield Scott, b. 1861; Holland, Philo Leon; Carlton, Edward P. Philadelphia : F. A. Davis Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksub, booksubjectneuroanatomy
