GABAergic somatostatin-immunoreactive neurons in the amygdala project to the entorhinal cortex

Highlights • Most amygdalar neurons labeled by Fluorogold injections into the entorhinal cortex are located in the basolateral amygdala. • About 1–5% of these amygdalar projection neurons are nonpyramidal neurons containing somatostatin and/or neuropeptide Y. • Slightly more than half of these long-range nonpyramidal neurons (LRNP neurons) express GAD or the m2 muscarinic receptor. • No LRNP neurons with entorhinal projections express parvalbumin or vasoactive intestinal peptide. • No amygdalar LRNP neurons project to the prefrontal cortex.