Elements of human physiology (1907) Elements of human physiology elementsofhumanp05star Year: 1907 THE SPINAL CORD 595 4. Clarke's column or posterior vesicular column (Fig. 2'il%%%%%%%%%%%%%%%%f), reaching from the seventh or eighth cervical nerve to the third lumbar nerve, and represented opposite the second and third cervical nerves by a small group of cells and possibly also in the sacral region by a group known as Stilling's nucleus. The cells composing this column are large and fusiform, with their long axes parallel to that of the cord, so that in cross- section they have the appearanc
Elements of human physiology (1907) Elements of human physiology elementsofhumanp05star Year: 1907 THE SPINAL CORD 595 4. Clarke's column or posterior vesicular column (Fig. 2'il%%%%%%%%%%%%%%%%f), reaching from the seventh or eighth cervical nerve to the third lumbar nerve, and represented opposite the second and third cervical nerves by a small group of cells and possibly also in the sacral region by a group known as Stilling's nucleus. The cells composing this column are large and fusiform, with their long axes parallel to that of the cord, so that in cross- section they have the appearance of small round cells. .pot Fig. 273. Directpyram/ri^^^ Ant. lat £t Direct Cerebellat Z-PosteriorJtoots. with collaterals. Spinal cord (after Lenhossek). On left side of figure are shown the nerve-cells with their axis-cylinder processes. On the right side the distribution of the chief collaterals. 1. Motor cells. 2. Cells of the columns. 2a. Cells of Clarke's column, sending processes across into direct cerebellar tract. 3, 4, and 5. Commissural cells. A more general classification of the nerve-cells may be based on the destmation of their nerve-fibre processes (Fig. 273). In this way we may distinguish— (1) Motor cells. These are the large cells already de- scribed in the anterior cornua. Their axis-cylinder processes all run out into an anterior nerve-root, and end for the most part in the motor end-plate on a muscular fibre. (2) Cells of the columns. The nerve-processes of these run out into the white matter, and the majority ascend in one of the columns of the cord. We find these cells in the anterior and lateral cornua, sending fibres into the anterior and lateral columns. There are also a few in the
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