Distal Hereditary Motor Neuronopathy Type 5b, also known as neuronopathy, distal hereditary motor, type 5b, is related to neuronopathy, distal hereditary motor, autosomal dominant 12. An important gene associated with Distal Hereditary Motor Neuronopathy Type 5b is REEP1 (Receptor Accessory Protein 1). Related phenotypes are pes cavus and decreased motor nerve conduction velocity