Dermatoglyphic maps method. Analysis of dermatoglyphics.

Date: 2015-10-07; view: 453.

Dermatoglyphic maps method has for an object of investigation the character of dermatoglyphs on finger-cushion (dactyloscopy), on feet (plantoscopy) and on palms (palmoscopy). Dermatoglyphs are formed by ridges (papilla of corium, (derma)) and named papillary line.

Dactyloscopy. The different various of fingerprint pattern are on finger-cushion, which may provide important clues to the diagnosis. The most widely distributed are found loop (L), arch (A), whorl (W). To analysis of fingerprint pattern three-radiuses (three-radii) or the places of three directions of papillae lines convergence are very important. In the case of arched fingerprint pattern there aren't any three-radii, in the case of loop fingerprint pattern there is one three-radius, and in the case of whorl fingerprint pattern there are two three-radius. And there is one very important feature more. It is named as number of papillary lines. It is the number of papillary lines, which are crossed by conditional line, conducted from the drawing center of fingerprint towards three-radius.

Plantoscopy. The palmar surface is divided to some regions, for instance thenar, hypothenar, and some other. There is own papillary pattern on each region. Besides, exist three-radii A, B, C, D on palms beside bases of fingers and exist axial three-radius T beside of bracelet pleat. The value (size) of angle АТD has diagnostic valuable. Healthy people have the value of this angle not more 57 degrees.

There are three of palmar pleats on palmar surface also: two transverse pleats and one pleat of thumb. Unhealthy people have the changed pattern. Two transverse pleats can be merged, forming transpalmar pleat.

In case of some heritable diseases the character of dermatoglyphics can be changed. For instance, in the case of Down's (trisomy 21) syndrome there are: transpalmar pleat, enlarged angle АТD, loops on all finger-cushion, dissociation of papillary pattern on thenar and hypothenar. However the separate analysis of dermatoglyphics doesn't give possibility to diagnose a heritable disease once and for all (finally). The finally diagnosis requires more deeply and complex examination.