Neuronopathy, Distal Hereditary Motor, Autosomal Dominant 2, also known as hmn iia, is related to distal hereditary motor neuronopathy type 2a. An important gene associated with Neuronopathy, Distal Hereditary Motor, Autosomal Dominant 2 is HSPB8 (Heat Shock Protein Family B (Small) Member 8). Affiliated tissues include spinal cord and peripheral nerve.