Quantitative data of cells stained with Nissl stain and immunoreactive with antibodies against voltage‐dependent anion channel (VDAC), glial fibrillary acidic protein (GFAP), CD8 (reactive microglia), nucleolin (NCL), nucleoplasmin 3 (NPM3), histone H3K9me2, ATP5H protein and superoxide dismutase 2 (SOD2) in the mediodorsal thalamus in control and FFI cases. Values are expressed as mean values ± SD. Assessed cell types are named in the left column excepting ATP5H and SOD2 immunoreactive cells which are neurons in controls and glia in FFI cases.