Neuronopathy, Distal Hereditary Motor, Autosomal Dominant 4, also known as hmn iic, is related to distal hereditary motor neuronopathy type 2c. An important gene associated with Neuronopathy, Distal Hereditary Motor, Autosomal Dominant 4 is HSPB3 (Heat Shock Protein Family B (Small) Member 3). Affiliated tissues include spinal cord and skeletal muscle.