[Regeneration of striated muscular tissue of the external rectal sphincter in the rat].

The reparative regeneration of striated muscular tissue of the external rectal sphincter was studied in albino rat following its injury caused by rectal stretching. It was shown that despite some peculiar features, the regeneration developed in accordance with histogenetic determination. Along with the death of some muscle fibers, some others were activated with the formation of undifferentiated elements. Proliferation of appearing myoblasts was followed by their differentiation and integration with the formation of new muscle fibers.