Archives of neurology and psychopathology. . eason to consider cither asdirect a fferent fibres of the posterior roots or as collateralsthereof. We have given arguments in favor of the viewthat these fibres terminate aiound the small cells of theparacentral group (perhaps also of the intermediate zone ?)and are thus destined for the enactment of spinal reflexesin the domain of the vegetative nervous system. Very frequently in young cats, and apparently on mostlevels also in man, Clarkes column and the paracentralcell group coalesce nearly into one group. Probably inthe adult cat the separation
Archives of neurology and psychopathology. . eason to consider cither asdirect a fferent fibres of the posterior roots or as collateralsthereof. We have given arguments in favor of the viewthat these fibres terminate aiound the small cells of theparacentral group (perhaps also of the intermediate zone ?)and are thus destined for the enactment of spinal reflexesin the domain of the vegetative nervous system. Very frequently in young cats, and apparently on mostlevels also in man, Clarkes column and the paracentralcell group coalesce nearly into one group. Probably inthe adult cat the separation is also incomplete so that thetwo may have partially common functions in such mannerthat some of the cells of Clarkes column (the larger ones)are concerned in afferent, others (the smaller ones) in RECAPITULATION OF THE RESEARCHES. 189 efferent functions. Similarly the large sporadic cells thatone meets in the paracentral group may have afferent,while the smaller ones which form the bulk of the grouphave efferent functions. pojt. H. « Text-Figure 10.—Diagram to show the ascent in the spinal cord ofthe afferent (the efferent fibres probably have a similar course in anopposite direction) fibres derived from the lumbar sympathetic chain,described in the text, pp. 127-8, as resulting from the degenerationsfollowing removal of lumbar sympathetic ganglia. post. H.—Posterior horn. ant. H.—Anterior horn. r. ventralis (anterior division) of lumbar nerve. r. dors.—Ramus dorsalis (posterior division) of lumbar nerve. sp. ggl.—Spinal ganglion. ant. R.—Anterior root. r. comm.—Ramus communicans. 190 EXPERIMENTAL RESEARCHES ON THE SYMPATHETIC. Two weeks after extirpation of the third, fourth andfifth lumbar sympathetic ganglia we observed degenerativechanges, both in the cells of Clarkes columns and in thefibres passing into them from the posterior roots. Thedegeneration in the fibres reaches from the third lumbarup to the thirteenth dorsal segment; on the oth
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