The perirhinal cortex comprises two narrow strips of cortex, areas 35 and 36 (often referred to as perirhinal and ectorhinal cortex respectively; Paxinos & Watson, 1998), which are adjacent to one another and situated approximately along the third quarter of the rhinal sulcus. Anteriorly, the perirhinal cortex includes the fundus of the rhinal sulcus, both banks, and the dorsally adjacent cortex. Moving caudally, areas 35 and 36 are situated inside and dorsal to the fundus of the posterior rhinal sulcus. The agranular insular cortex (AIp) and granular/dysgranular insular cortex form the cortical areas located anterior to the perirhinal cortex. Area 36 is located caudal to the granular/dysgranular portion of the insular cortex, and area 35 is located caudal to AIp. It is generally accepted that when the claustrum is no longer visible, insular cortex is no longer present and is replaced by the perirhinal cortex (Burwell 1995).
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