Neuronopathy, Distal Hereditary Motor, Autosomal Dominant 3, also known as hmn iib, is related to distal hereditary motor neuronopathy type 2b and charcot-marie-tooth hereditary neuropathy. An important gene associated with Neuronopathy, Distal Hereditary Motor, Autosomal Dominant 3 is HSPB1 (Heat Shock Protein Family B (Small) Member 1). Affiliated tissues include spinal cord and peripheral nerve.