FIG 4. Coronal 2-mm-thick MR images from a control subject demonstrate the outline of the PCA at different rostrocaudal levels. Line drawings of the same MR imaging sections demonstrating more anatomic details are shown in Figure 5 (numbers in the lower left corner correspond to the levels of the line-drawings). A is the most rostral and K is the most caudal. In panels A and B, the thickness of the perirhinal cortex, which serves as reference for the thickness of the PCA is indicated. Panel C marks the anterior-most limit of the entorhinal cortex. In panels D, E and F, the characteristic ovoid shape of the amygdala can be recognized. Panel G shows the appearance of the subiculum. Panels H–K show the hippocampal head. EC indicates entorhinal cortex; cs, colateral sulcus (arrow); A, amygdala; es, endorhinal sulcus (arrow); HC, hippocampus; hf, hippocampal fissure (arrow); LI, limen insulae; PRC, perirhinal cortex; ssa, sulcus semiannularis (arrow); Sub, subiculum; and arrowheads, boundaries of the entorhinal and perirhinal cortices. Scale bar equals 10 mm (applies to all panels).