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The extended amygdala has been implicated as a critical region in the neurocircuitry underlying anxiety. The circuitry of the extended amygdala, including the central (CeA) and basolateral (BLA) nuclei of the amygdala and the bed nucleus of the stria terminalis (BNST), has been well defined in nonhuman animals; however, much less is known about the roles and interactions of these structures in humans given their small size. Therefore, this study used high-resolution 7-Tesla magnetic resonance imaging to define, compare, and contrast functional connectivity (FC) of these structures in 57 neurologically healthy young adults. In addition, FC was investigated in relation to self-reported measures of anxiety and intolerance of uncertainty, a key feature of anxiety. Results of the FC analysis of each of the nuclei largely replicated previous work. Conjunction analyses showed that nuclei of the extended amygdala shared …