The hypothalamus is a small but powerful part of the brain that regulates several essential bodily functions. Synonyms for the hypothalamus include the "brain's thermostat," due to its role in controlling body temperature, as well as the "master gland," because it controls the release of hormones from the pituitary gland. Other synonyms for the hypothalamus include the "integrative center," as it integrates information from various parts of the brain to control homeostasis, and the "appetite control center," due to its role in regulating hunger and satiety. Finally, the hypothalamus is also sometimes referred to as the "primitive brain," due to its evolutionary significance and involvement in basic survival functions.