. A treatise on nervous and mental diseases, for students and practitioners of medicine. Drawing of cells from the anterior horns of the spinal cord. Obtained by tappingthe fresh cord of an ox. former along the bottom of the anterior median fissure, to the latterin a way that is as yet a matter of conjecture. The fibres from theposterior or sensory nerve roots enter the cord, first going to theganglion upon the posterior root, which innervates these posteriorroot fibres in the same way in which the anterior horn cellsinnervate the anterior nerve root fibres. Thus, as we shall see instudying my
. A treatise on nervous and mental diseases, for students and practitioners of medicine. Drawing of cells from the anterior horns of the spinal cord. Obtained by tappingthe fresh cord of an ox. former along the bottom of the anterior median fissure, to the latterin a way that is as yet a matter of conjecture. The fibres from theposterior or sensory nerve roots enter the cord, first going to theganglion upon the posterior root, which innervates these posteriorroot fibres in the same way in which the anterior horn cellsinnervate the anterior nerve root fibres. Thus, as we shall see instudying myelitis of the anterior horns, a degeneration of these ante- ANATOMY. 61 rior horn cells causes degenerative changes in the anterior nerve rootfibres. In the same way, section or disease of the ganghon uponthe posterior root causes degeneration of the peripheral nerve fibres Fig. Drawing from a photo-micrograph, made by McDonald, showing the cells of theanterior cornua as they lie imbedded in a specimen hardened in bichromate by thealum Weigert method, and afterward magnified 360 diameters. of this posterior root, so that this ganglion upon the posterior root,and not the posterior horn, is the innervating ganglion of these pos- FiG. 43.
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