Amygdala nuclei boundaries. The boundaries of two groups of amygdala nuclei were determined by 2 observers. A, The CM group of nuclei for the right hemisphere is shown in blue for a representative monkey in three coronal sections, and one sagittal and one horizontal section. B, The BL group of nuclei for the same monkey is shown in yellow. C, Representative boundary contours between the CM (blue, hashed) and BL (yellow) nuclei that were used to derive ROI volumes, in three coronal and one sagittal plane. The CM group includes areas of the extended amygdala.