[Decussations in the human muscular system].

There are decussations in all groups of muscles: mimic, m. masseter, in muscles of the trunk and extremities. The classification presented divides all the decussations into 3 groups: 1 -- decussations of the muscles situated in the neighbouring layers of the same topographic area; 2 -- decussations of muscles-synergists a) at the place of their origin, b) along their course, c) at the place of their attachment; 3 -- decussation of fibres within the limits of one muscle, as well as decussation of tendons in one muscle. If there is a decussation in a definite group of muscles, it is possible to suggest that there is a decussation in the antagonistic group of muscles or in the muscles situating at the opposite side of the trunk. Conformity of decussations in the antagonistic groups of muscles can surve as a morphological demonstration of their functional unity. Basing on the laws of biomechanics and constructive engineering, an attempt is made to explain the biological expedience of the oblique and crossed course of the muscles. In the orthopedic operative surgery in order to strengthen the joints, artificial muscle decussations are used, thus natural models of the crossed course of the muscles become more firm. Owing to the regularities stated, it is possible to elaborate new reconstructive operations in various parts of the human body.