A treatise on the principles and practice of medicine . GANGLION CELL OF ANT. HORNBEGINNING OF 2ND NEURONE -END OF 2ND NEURONEIN MUSCLE PLATES Fig. 62.—Illustrating the general outlines of the upper and lower neurones and of the direct(), and crossed (), pyramidal tracts. lOCTS. pos ROOT Fig. 63.—Showing the different tracts of the cord. (Gowers.) 822 DISEASES OF THE SPINAL CORD c 1. Dl. 10., 11. 12., n <& I Dl, in Figs. 61 and 62). The direct pyramidal tract probably crosses to theanterior horn of the opposite side by way of the white portion of thecommissure of the cord. The u
A treatise on the principles and practice of medicine . GANGLION CELL OF ANT. HORNBEGINNING OF 2ND NEURONE -END OF 2ND NEURONEIN MUSCLE PLATES Fig. 62.—Illustrating the general outlines of the upper and lower neurones and of the direct(), and crossed (), pyramidal tracts. lOCTS. pos ROOT Fig. 63.—Showing the different tracts of the cord. (Gowers.) 822 DISEASES OF THE SPINAL CORD c 1. Dl. 10., 11. 12., n <& I Dl, in Figs. 61 and 62). The direct pyramidal tract probably crosses to theanterior horn of the opposite side by way of the white portion of thecommissure of the cord. The upper segment is largely crossed, but the lower segment (or neurone) is a direct tract,the cells in the anterior horns supplyingmuscles of the same side of the body. The cord therefore contains parts of bothneurones, the course of which has been ascer-tained by the secondary descending degnerationwhich follows neurone lesions. Turck firstfully described its occurrence and Flechsigand Bechterew added information from em-bryological studies. After a lesion, as hemor-rhage in the internal capsule, the fibers of theupper neurone below the lesion degenerate;granule-bearing cells appear and the axis-cylinders swell, degenerate and stain poorlyby the Marchi method, because the axonesa
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