MorphologyMorphology1026-35432949-2556Eco-Vector10181610.34922/AE.2020.158.4.008Research ArticleARCHITECTONICS OF THE BRANCHES OF THE AORTIC ARCH, CELIAC AND SUPRARENAL ARTERIES IN BAIKAL SEALRyadinskayaN. I.Department of Anatomy, Physiology and Microbiologyryadinskaya.nina@mail.ruAnikienkoI. V.Department of Anatomy, Physiology and Microbiologybabushcinai@mail.ruMol’kovaA. A.Department of Anatomy, Physiology and Microbiologymolkova-1980@rambler.ruSaivanovaS. A.Department of Anatomy, Physiology and Microbiologyms.svetikss@mail.ruTabakovaM. A.Department of Anatomy, Physiology and Microbiologymary.1311@mail.ruIl’inaO. P.Department of Anatomy, Physiology and Microbiologyolgailina56@mail.ruA. A. Ezhevsky Irkutsk State Agrarian University151020201584-5535927022022Copyright © 2020, Ryadinskaya N.I., Anikienko I.V., Mol’kova A.A., Saivanova S.A., Tabakova M.A., Il’ina O.P.2020Objective - to study the architectonics of the aortic arch branches, as well as blood vessels of the spleen, liver and adrenal glands in the Baikal seal. Material and methods. The research was carried out on 60 immature Baikal seals aged from 1 year to 4 years. The architectonics of the vascular system in the Phoca sibirica was studied using a combination of methods (anatomy dissection, production of vascular corrosion casts, graphic simulation, histological and morphometric analysis). Statistica 6,0 software was used to process the results. Anatomic terms in the present research were used according to the International Veterinary Anatomical Nomenclature (2017) and International Histological Nomenclature (2017). Results. The following anatomical characteristics of Baikal seal blood vessels were revealed: the aortic arch had an ampulla-type dilatation; the brachycephalic artery arised from the right side of the aortic arch; the left common carotid and subclavian arteries arised from the left side of the aortic arch. The spleen blood supply was characterized by venous sinuses in the red pulp. Three branches of the subclavian arteries symmetrically arising from the abdominal aorta, and one subclavian artery arising from the renal artery supplied the adrenal glands. The venous system consisted of two trunks of the caudal vena cava, a large hepatic sinus, an ampulla-type dilatation of hepatic veins and a diaphragmatic sphincter. Conclusions. Specific anatomical characteristics of the Baikal seal vascular system associated with its way of life were demonstrated.aortaveinsliverspleenadrenal glandаортавеныпеченьселезенканадпочечники[Кузин А. Е. 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