A system of medicine, by many writers; . to the explanation of some of theimportant clinical phenomena of tabes? Reference to the diagram(Fig. 1) will help to explain some of the phenomena of tabes ; namely, thediminution of tonus in the muscles, the incoordination, the absence ofthe knee-jerk, the ataxic gait, Rombergs symptom, and the various dis-turbances of sensation. The afferent system of the neurons of the .spinal ganglion conveysensations from the skin, the muscles, and the tendons and joints, and thesesensations travel by three sets of fibres: (i.) Short, forming the spinalreflex arc
A system of medicine, by many writers; . to the explanation of some of theimportant clinical phenomena of tabes? Reference to the diagram(Fig. 1) will help to explain some of the phenomena of tabes ; namely, thediminution of tonus in the muscles, the incoordination, the absence ofthe knee-jerk, the ataxic gait, Rombergs symptom, and the various dis-turbances of sensation. The afferent system of the neurons of the .spinal ganglion conveysensations from the skin, the muscles, and the tendons and joints, and thesesensations travel by three sets of fibres: (i.) Short, forming the spinalreflex arc ; (ii.) Medium length fibres Avhich Ijrcak up into a brushworkaround the cells of Clarkes column, the axis-cylinder processes of whichform the direct cerebellar tract : (iii.) Lonrj filnn^, which form Oolls columnand break up into a terminal around the cells of tlic luicleusgracilis. These fil)res convey kiiuosthctic impulses to the scnsDri-niotorregion of the cortex by the fillet and the thalamus opticus, and are brought. PLATE I Drawing from a photomicrograph of a spinal ganglion in a case of combined sclerosis ofposterior columns and lateral columns. The microscopical specimen was stained by Stroebesmethod. The normal cells are stained purple, the degeneratefl cells are stained red. This redstaining is due to a pigmentary degeneration of a fatty nature, for other sections stained by Palmethod shows these same large cells stained purple. Examined with a high power, the cells areseen to be permeated throughout with fine highly refractive grannies. In many of the cells thenucleus has disappeared. A similar condition of tlie cells I have observed in a case of tabes,but not so pronounced. It is possible that this change may be due to terminal infection. Magni-fication 200. Fade page 108. TABES DORS A LIS 109 into relation Avith the efferent pyramidal system. There are thus ilireenervous circles—spinal reflex, cerebellar, and cerebral. The true motorneuron Avhich c
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