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T2‐weighted magnetic resonance images of the human midbrain showing the subthalamic nucleus (STN). A: axial plane; B: sagittal plane; C: coronal plane; Ci, capsula interna; Gp, globus pallidus; Ot, optical tract; Pu, putamen; Sn, substantia nigra; Zi, zona incerta; dashed line, STN.
