(a) Coronal section of rhesus macaque brain following dissection of hippocampal tissue analyzed in this study. (b) Directional diffusion FA map of hippocampus. Anisotropic diffusion oriented in the left/right, up/down, and in/out of plane directions are indicated by red, blue, and green colors, as described in the text. (c) A 2D montage of a 200 μm-thick hippocampal tissue section obtained at 10x magnification using 3D confocal microscopy. (d) Directional FA map of the region subsequently analyzed by 3D confocal microscopy. Dashed black rectangle indicates the location of the yellow box in Fig. 1b, and corresponds to the location indicated by the yellow box in Fig. 1c. (e) One slice of the 3D image acquired at 63x magnification, digitized at 0.25μm resolution on confocal microscope. Scale bars (a) 10 mm, (b) and (c) 1mm, (d) and (e) 200 μm; Abbreviations: ILF: Inferior longitudinal fasciculus; CA: Cornu Ammonis.