Proceedings of the International scientific and practical conference ―Synergy of Modern Science and Education‖ (February 2-4, 2026) / Publisher website: www.naukainfo.com. – New York, USA, 2026. - 324 p.

104 MILITARY SCIENCES, NATIONAL SECURITY AND STATE BORDER SECURITY UDC 612.43:612.821:591.3:599.323.4 Demchenko Olena Mykhailivna Doctor of Biological Sciences, Professor of the Department of Physiology Rodynska Galyna Oleksandrivna Candidate of Medical Sciences, Associate Professor of the Department of General Surgery, Surgery, Orthopedics and Traumatology of the Faculty of Postgraduate Education Hrytsenko Anastasiia Oleksyivna Student Dnipro state medical university Dnipro city, Ukraine THE ROLE OF THYROID HORMONES IN SHAPING THE BEHAVIOR OF RATS UNDER EMOTIONAL STRESS DURING EARLY ONTOGENESIS Introduction. Early ontogenesis is a critical period in the formation of the nervous system, during which hormonal factors play a key role in the development of neurochemical mechanisms regulating behavior and emotional responses. Thyroid hormones exert a pronounced influence on the processes of neurogenesis, synaptogenesis, and neuronal differentiation, as well as on the functioning of the main neurotransmitter systems of the brain. Disturbances of thyroid status in