Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . e same side(instead of the opposed side) ; as well as those cases of greater frequencywhere a paresis of the corresponding side coexists with a hemiplegiaof the side opposed to the cerebral lesion. In one ease in sixty, nodecussation of the pyramidal tracts occurs. SCLEROSIS OF THE MOTOR FIBRES OF THE LATERAL COLUMN. (Lateral Spi7ral Sclerosis—Tetanoid Paraplegia—Spastic Paralysis—Sjiasnwdic Tabes.) Within the lateral columns
Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . e same side(instead of the opposed side) ; as well as those cases of greater frequencywhere a paresis of the corresponding side coexists with a hemiplegiaof the side opposed to the cerebral lesion. In one ease in sixty, nodecussation of the pyramidal tracts occurs. SCLEROSIS OF THE MOTOR FIBRES OF THE LATERAL COLUMN. (Lateral Spi7ral Sclerosis—Tetanoid Paraplegia—Spastic Paralysis—Sjiasnwdic Tabes.) Within the lateral columns of the cord, we encounter a bundle of motor fibres which decussate anteriorly in the medulla at its lowest part. They are, therefoi-e, associated with the opposite cerebral hemis- 358 LECTURES ON NERVOUS DISEASES. phere. These fibres occupy only :i portion of each lateral column, andlie adjacent to the posterior horn of the spinal gray matter. They arcknown as the crossed pyramidal fibres. They are separated from theperiphery of the spinal cord (in some of the spinal segments, although MOTOR F/BR£Sor JJITTRAI COLUMN AWSCLESCOfmtouSD BY effCH SPINffLSEGMENT. CELLS OF THE\RMrEmOJi HORNS[OF SUCCESSIVE Sfi/MML SEGMENrS Fig. 93.—A Diagram designed by the Author to show the DiSTRiBaTioN op theCrossed Pyramidal Fibres (of one side) to the Cells of the Anterior HornOF Successive Spinal Segments.—Note that the motor fibres of the lateral column canact upon the muscles only indirectly (through the cells of the anterior horn): also that eachsegment of the cord receives from the lateral column certain fibres which put the musclesassociated with that particular segment in the circuit of cerebral influence (volition). Inthis diagram, the circles represent groups of cells, and not a single cell. Each red fibrerepresents a bundle ofjibres having similar termination. The blue lines represent bundlesof motor fibres, which form the anterior nerve-root of successive spinal segments Thet
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