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The amygdala is a cortical component of the limbic system of the brain, though it is considered to be subcortical by some. It is an anatomical (though not functional) extension of the tail of the caudate nucleus in the temporal lobe, and is the most medial part of temporal lobe forming uncus. The amygdala lies rostral to the hippocampal formation, and it is a diffuse patch of gray matter which does not belong to any of the neocortical, mesocortical, and archicortical groupings. It is a crucial area for processing emotional and motivational responses.