"Composite of three images, one in top row (described in caption as A), two in second row (described in caption as B). Top shows a mid-line sagittal plane of the brainstem and cerebellum. There are three circles superimposed along the brainstem and an arrow linking them from bottom to top and continuing upward and forward towards the frontal lobes of the brain. A line of text accompanies each circle: lower is ""1. Dorsal Motor X Nucleus"", middle is ""2. Gain Setting Nuclei"" and upper is ""3. Substantia Nigra/Amygdala"". A fourth line of text above the others says ""4. ..."". The two images at the bottom of the composite are magnetic resonance imaging (MRI) scans, one saggital and the other transverse, centred at the same brain coordinates (x=-1, y=-36, z=-49). A colored blob marking volume reduction covers most of the brainstem."
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