<unk> ,<unk>  lines of skin tension, or sometimes called cleavage lines, are topological lines drawn on a map of the human body. They are parallel to the natural orientation of collagen fibers in the dermis, as well as the underlying muscle fibers.<unk>  have relevance to forensic science and the development of surgical techniques.
Langer's lines
Beau's lines
Klein's line
Blaschko's lines
Pastia's lines
Burton's line
Schwalbe's line
Blumensaat's line