The authors performed the study in 24 Soviet Chinchilla rabbits, males and females, at the age of 1–1,5 years of 3,5–4-kg body weight without the nervous system and locomotorium pathology. They determined the number of vertebrae in each of the spine parts, as well as their morphological parameters by X-rays and in boiled preparations. The thoracolumbar spine of the examined rabbits consisted of 19 or 20 vertebrae distribution of which in the thoracic and lumbar spine varied significantly. The thoracic spine included 12 vertebrae, the lumbar spine – 7 ones in 58.4 % of the rabbits. 25 % of the animals had eight (8) lumbar vertebrae with the same number of thoracic vertebrae. The other animals had 13 thoracic vertebrae, while the number of lumbar vertebrae varied: 8.3 % of the rabbits had seven (7) vertebrae, and 8,3 % of them – 6 vertebrae. The data should be taken into consideration when evaluating the spine pathologic conditions, performing surgical interventions, as well as when standardizing studies and interpreting their results in the field of experimental vertebrology and neurosurgery.