[A tentative plan of measuring the amount of the stretch of the skin using origin on body surface].

Abstract

The present study was made to search for the origin on human dorsal surface, which is available for a correct grasp of a change of body surface (skin surface) with human activities and to try to re-evaluate, using the above origin, quantitative skin deformation of human dorsal surface on raising arms. The following results were obtained: 1) X. examination in standing (static) and arm-raising (dynamic) positions revealed a site with inter-positional difference, as zero, in slippage on dorsal median line. This site was supposed to be the origin and was confirmed to be Th10 and Th12. The palpation of the site of, Th10 and Th12 on dorsal median line was thought to be simple and effective in searching for a site with the least bone and skin slippage, thus in presuming the origin. 2) Based upon the origins on dorsal median line and scapular line parallel thereto in sitting position, 5 cm phi-correct circles were stamped up and down, then arm raising action was taken. The utilization of the origin enabled us to determine the length, directional angle, theta, and area, S, of the slippage between correct and distorted circles as obtained by these actions. 3) For arm raising, the skin slipped up and down on median line for lower and higher sites than the origin, respectively, with the angle theta on scapular line indicating the + direction, while and theta appeared greater and smaller for a nearer site to the origin, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)