Langer's lines
(重定向自Tension lines)
Langer's lines, Langer lines of skin tension, or sometimes called cleavage lines, are topological lines drawn on a map of the human body. They correspond to the natural orientation of collagen fibers in the dermis, and are generally parallel to the orientation of the underlying muscle fibers. Langer's lines have relevance to forensic science and the development of surgical techniques.