Objective. To identify the features of m. psoas minor histogenesis in growing dogs under conditions of the development of spinal scoliotic deformity. Material and Methods . Experiments were performed on 16 four-month-old mongrel dogs, males and females. In animals of Series I, the deformity was created by gangliotomy at five lumbar motion segments (L 2 -L 6 ), in animals of Series II - by fixation of adjacent L 3 -L 6 vertebral bodies with nickel titanium staples possessing thermochemical shape memory effect, and in animals of Series III - by implantation of titanium plates into the subchondral zone of vertebral growth plates, together with the staples. The control series included intact age-matched dogs. The X-ray examination of animals of Series I-III was performed in dorsoventral and lateral views at days 14, 30, 60, 90, and 180 after surgery. Paraffin and semi-thin sections of m. psoas minor from concave and convex sides of the lumbar scoliotic deformity zone were studied using light microscopy in 3 and 6 months after surgery. Results . Standard signs of degenerative-dystrophic changes and reparation by restitution/substitution type characterize the histogenesis of m. psoas mino r. The most marked destructive changes in the muscles on both sides of the deformity retained in the long-term only in animals of Series III. Conclusions . The study results can be used for evaluating the adaptation and plasticity potential of paravertebral muscles, as well as for developing models of the spine scoliotic deformity.