Photomicrograph of the midbrain shows the white matter between the red nucleus and substantia nigra, where the nerve fibers (arrow) extend in the obliquely.

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Photomicrograph of the midbrain shows the white matter between the red nucleus and substantia nigra, where the nerve fibers (arrow) extend in the obliquely ventrodorsal direction (Klüver-Barrera stain; original magnification, ×40). Photomicrograph of the midbrain shows the white matter between the red nucleus and substantia nigra, where the nerve fibers (arrow) extend in the obliquely ventrodorsal direction (Klüver-Barrera stain; original magnification, ×40). R indicates red nucleus; SN, substantia nigra; arrowhead, pigmented neurons Michito Adachi et al. AJNR Am J Neuroradiol 1999;20:1500-1506 ©1999 by American Society of Neuroradiology