[Vascular changes in maturing granulation tissue].

Granulation tissue was examined in rats on the 20th and 40th day after wounding of the back. It was shown that by both the 20th and the 40th day the vessels with impaired typical structure could be revealed together with the normal ones in the granulation tissue. Specific rearrangement was observed in the structure of these vessels, consisting in the impairment of their wall integrity, separation of the constituent cells and their free position among the other cells and fibrous structures. This process is especially marked by the 40th day. 3H-thymidine was actively incorporated by some fibroblasts and rather often by the cells of both normal and degenerating vessels. The authors suggest the existence of an earlier unknown phenomenon of transformation of capillary vessels, common for both normal dermal and reparative processes after injury. The essence of the phenomenon consists in the fact that small dermal vessels get permanently disintegrated and are included into the composition of cellular elements of the interstitial tissue, and form again, providing for the physiological regeneration of dermal cells and fibrous structures.