Multifocal Motor Neuropathy Fund

Multifocal Motor Neuropathy (MMN) is a rare disorder characterized by slowly progressive muscle weakness, primarily of the arms and legs. The term multifocal means arising from two or more spots. The term motor refers to the motor nerves, which are those that carry nerve impulses from the brain to the muscles. The exact underlying cause of this disorder is not fully understood. The disorder is acquired at some point during a person’s life; a person is not born with the disorder.