[Reparative regeneration of cat spinal cord nerve fibers].

Morphology of the regenerative process of certain neural elements at the place where the medullar scar was forming after a lateral hemisection was studied in the cat spinal cord at the level of the 11th thoracic segment. The observations were performed for 3 days--1 year. Methods of light and electron microscopy were applied. It was states that most of conductive tracts are capable for regeneration, nevertheless, the restoration of their integrity does not occur, since regenerating fibres have a marked tendency to form collaterals of the terminal type. The regeneration is accompanied by the formation of axodendritic and axo-axonic synapses whose role is not clear. The neural fibres regeneration is completed for 1 month on the background of a decreased neuroglial reactivity and contributes to its activation and purposeful proliferation which prevents the connective tissue growth. The neural fibres and terminals forming in the regenerative process are preserved for a year without any definite sign of degeneration if a well pronounced glial membrane is present.