. A treatise on nervous and mental diseases, for students and practitioners of medicine. Photo-micrograph of the cervical region of tlie cord in a case of diameters. the course of some motor set of fibres, the former along the courseof some sensory set of fibres ; in other words, these degenerations areusually in the course of the nerve impulses, so that in the motor Fig. Drawing of a section of the cord showing a secondary degeneration of the columns orGoll after myelitis. Magnified 10 diameters. columns they are downward as the motor impulses pass from withinoutw
. A treatise on nervous and mental diseases, for students and practitioners of medicine. Photo-micrograph of the cervical region of tlie cord in a case of diameters. the course of some motor set of fibres, the former along the courseof some sensory set of fibres ; in other words, these degenerations areusually in the course of the nerve impulses, so that in the motor Fig. Drawing of a section of the cord showing a secondary degeneration of the columns orGoll after myelitis. Magnified 10 diameters. columns they are downward as the motor impulses pass from withinoutward, and in the sensory columns they are upward as the sensoryimpulses pass from without inward. This law of degeneration, how-ever, is by no means invariable, although it is so general as to make SPINAL CORD AND MEDULLA OBLONGATA, 203 it an excellent guide in tracking the course of fibres and determin-ing whether they are sensory or motor. In this case with which weare dealing, however, the degeneration did not strictly follow thislaw, as in some places the degeneration was upward in the motorcolumns and downward in the sensory, although the main degenera-tions were in accordance with the rule. This seeming contradictionwas due to the fact that, in the case here photographed, the inflam-matory changes followed nerve-strands either upward or downward,whilst the alterations in the nerve fibres
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