The hypothalamus is a major part of the brain that controls the autonomic nervous system, the endocrine system, body temperature regulation and more. It is vital to maintaining homeostasis.
References
professional, Cleveland Clinic medical. “Hypothalamus: What It Is, Function, Conditions & Disorders.” Cleveland Clinic, my.clevelandclinic.org/health/body/22566-hypothalamus. Accessed 1 Dec. 2023.