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Sub-atantive changes in nerve tissue associated with hysteriosis

Sub-atantive changes in nerve tissue associated with hysteriosis

Fiziol Zh Sssr Im I M Sechenova 51(8): 960-965

Vital staining revealed changes occurring in nerve cells of the spinal ganglion and nerve fibers of frogs associated with hysteriosis (Wedensky's term for the hyper excitability of nerve centers caused by prolonged tetanization of a nerve). Using spinal frogs, the peroneal nerve of the right leg was subjected to prolonged tetanization and the same nerve of the left leg acting as the test nerve. Tetanization and measurement of the thresholds were performed by a DuBois-Raymond induction apparatus powered by a 3 volt battery. The state of hysteriosis was recorded by the drop of the threshold of excitability of the test peroneal nerve. After tetanization stopped, about an hour after the start of excitation, the vertebral canal of the frogs was quickly opened and the 8th-9th pairs of spinal ganglia with nerves and roots were extracted, cleaned, and stained with neutral red (0.1% solution), methyl violet (0.025%), and acid fuchsin (0.1%) prepared on Ringer's solution, There are changes in the sorption of vital stains by ganglia and nerves of frogs in hysteriosis; the sorption capacity of ganglia which has a high initial level of sorption dropped in hysteriosis. The capacity to form granules lessened in these ganglia along with weaker staining of the general background. The sorption capacity of ganglia that had a low initial level of sorption increased in hysteriosis, granulation was enhanced, and a raspberry shade of stain appeared. Binding of the stain by the nerves during development of hysteriosis increased only in the group of animals subjected to prolonged tetanization. The ganglia and nerves of the tetanized side adsorb more stain than the tissue of the test side. Prolonged tetanization of a nerve causes hyperexcitability of nerve centers which involves physicochemical changes in the tissues which can be recorded by vital stains.

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Related references

Substational changes in nerve tissue in hysteriosis. Fiziologicheskii Zhurnal SSSR Imeni I. M. Sechenova 51(8): 960-965, 1965

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