Figure 4.

Coronal sections showing rostral perirhinal cortex (PER) and bordering regions. Shown are the rostrally adjacent insular region (VISC) at one level (top row) and the perirhinal areas 35 and 36 at 2 rostrocaudal levels (middle and bottom rows). At each level, adjacent sections were stained for Nissl material (A,D, and G), heavy metals using Timm’s method (B, E, and H), myelinated fibers (C and I), and the enzyme acetycholinesterase (F). The claustrum, located deep to insular cortex, is easy to identify in Nissl and Timm’s material. It is outlined in panel A and designated by the white arrow in panel B. Other abbreviations: AIp, posterior agranular insular; AUDv, ventral auditory cortex; ec, external capsule; ENTl, lateral entorhinal area; EPd, the dorsal part of endopiriform nucleus; PIR, piriform cortex; SSs, secondary somatosensory.