Cortical inhibitory interneurons powerfully shape information processing in cortical networks. Their wide diversity endows cortical microcircuits with a variety of computational capabilities. The perirhinal cortex has been shown to have a low density of parvalbumin-expressing interneurons (PV-IN), the most abundant inhibitory cell type in the cortex. However, the density and composition of the GABAergic population in perirhinal is still unknown. I used a combination of neuroanatomy, intersectional genetics and in vitro physiology to describe the diversity of GABAergic neurons in the mouse perirhinal cortex. I will show that PV-IN are a minor population in perirhinal cortex, and their density decreases along the rostro-caudal axis. Moreover, a population negative for PV, somatostatin and vasoactive intestinal peptide represents the largest population across the layers of perirhinal cortex. I am using in vitro physiology and intersectional genetics to dissect this peculiar population of interneurons in perirhinal cortex.