[Histologic study of arrangement patterns of dermis fibers to facial Langer's lines and Kraissla's lines].

This paper presents studies on the relationship of the arrangement of the dermal collagen and elastic fibers to the Langer's and Kraissla's Lines. A total of 360 histologic sections in three directions from 30 sites of each Lines on six cadaver's faces were examined and measured. The results demonstrate that the collagen fibers underlying the Langer's Lines are irregularly and interweavingly arranged whereas they are paralleling the Kraissla's Lines and at the same direction. The elastic fibers underlying the Langer's Lines are paralleling or perpendicular to the epidermis, while they are perpendicular to the Kraissla's Lines. Due to the difference in arrangement of these two kinds of fibers, the incision along the Kraissla's Line is more reasonable because it will run along the direction of the greatest skin tension and the least split of the wound. Further, the collagen fibers of the wound scar will arrange in accordance with the surrounding structures. The face may be divided into three regions based on the directions of incision: the regions in which the incision should be made along the Kraissla's Lines, along both Lines, and not along both Lines.