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Purpose. To test the model of spinal cord lateral hemiexcision in young rats. Materials and methods. Animals ‒ male rats (age about 1 month, body weight about 50 g, inbred derivatives of the Wistar line); the number of experimental groups is: 1) lateral spinal cord hemisection at the level of segments about T12–T13 (Sect; n=11); 2) lateral spinal cord hemiexcision about 1 mm long at the similar level (Exc; n=8). Assessment of motor Function Index (FI) and the Spasticity Index (SI) of the paretic hindlimb was carried out using the Basso–Beattie–Bresnahan (BBB) scale and Ashworth scale, respectively, in our technical modifications. The non-inclusion criteria: the BBB score above 9 points of FI for the ipsilateral hindlimb in a week after injury ‒and / or BBB score less than or equal to 14 points of FI of the contralateral hindlimb during a long follow-up period (in general, 2 animals in the Sect group, 3 animals ‒ in the Exc group). Asymptotic differences in the timing of testing between subgroups and groups were revealed during the first three weeks of follow-up. Interpolation reproduction of individual values of FI and SI was used in exceptional cases. The total follow-up period was 5 months. Statistical analysis was performed using the Mann-Whitney U Test, Wilcoxon Matched Pairs Test, Spearman’s Rank Order Correlation. For pathomorphological study, the method of silver impregnation of the spinal cord longitudinal sections of the Exc group animals obtained in 5 months after the simulation of injury was used. Results. One week after injury, the FI in the Sect group was 5.9±1.1 according to BBB points, a statistically significant increase in the FI lasted for the first 3 weeks (p

Corrections to the article: https://doi.org/10.25305/unj.234154 In the article by V.V. Medvedev et al., published in UNJ № 3 in 2021, the source number 92 from the reference list does not support the statement given in the appropriate place in the text. Instead, we offer the reader two other works that mention the presence of posterior median spinal artery in the adult rat - D. Mazensky et al. (2017) and O.U. Scremin (G. Paxinos, ed.; 2015, p. 1003, 1005). In most works on this topic (Z. Zhang et al., 2001; Y. Cao et al., 2015; P. Li et al., 2020) the dorsal median vein is considered as the median vessel of the posterior surface of the rat spinal cord, and as in humans, describe 2 parallel dorsal spinal arteries. At the same time, D. Mazensky et al. (2017), sharing the opinion of O.U. Scremin (2015), mention 3 dorsal spinal arteries of the rat, in particular the median one. Taking into account that, from our experience, damage to the median vessel of the posterior surface of the spinal cord is accompanied by its rapid edema and irrepversible deep deficit in the motor function of both hind limbs of the animal, we consider it necessary to draw the reader's attention to this feature of the anatomy of the spinal arteries of an adult rat. Medvediev VV, Abdallah IM, Draguntsova NG, Savosko SI, Vaslovych VV, Tsymbaliuk VI, Voitenko NV. [Model of spinal cord lateral hemi-excision at the lower thoracic level for the tasks of reconstructive and experimental neurosurgery]. Ukr Neurosurg J [Internet]. 2021 Sep 27 [cited 2021 Oct 11];27(3):33-5. Available from: http://theunj.org/article/view/234154 Cao Y, Wu T, Yuan Z, Li D, Ni S, Hu J, Lu H. Three-dimensional imaging of microvasculature in the rat spinal cord following injury. Sci Rep. 2015 Jul 29;5:12643. doi: 10.1038/srep12643. PMID: 26220842; PMCID: PMC4518284. Li P, Xu Y, Cao Y, Wu T. 3D Digital Anatomic Angioarchitecture of the Rat Spinal Cord: A Synchrotron Radiation Micro-CT Study. Front Neuroanat. 2020 Jul 22;14:41. doi: 10.3389/fnana.2020.00041. PMID: 32792915; PMCID: PMC7387706. Mazensky D, Flesarova S, Sulla I. Arterial Blood Supply to the Spinal Cord in Animal Models of Spinal Cord Injury. A Review. Anat Rec (Hoboken). 2017 Dec;300(12):2091-2106. doi: 10.1002/ar.23694. Epub 2017 Oct 13. PMID: 28972696. Paxinos G, editor. The rat nervous system. 4th ed., London: Elsevier; 2015. Scremin OU. Capter 31, Cerebral Vascular System; p. 985‒1011. Zhang Z, Nonaka H, Nagayama T, Hatori T, Ihara F, Zhang L, Akima M. Circulatory disturbance of rat spinal cord induced by occluding ligation of the dorsal spinal vein. Acta Neuropathol. 2001 Oct;102(4):335-8. doi: 10.1007/s004010100377. PMID: 11603808.