The most vulnerable synapse: historic aspects of neuromuscular junction disorders. Reliability of neuromuscular transmission and how it is maintained. The neuromuscular junction. Electromyographic aspects of neuromuscular junction disorders. The immunopathogenesis of myasthenia gravis. Autoantibodies in different forms of myasthenia gravis and in the Lambert-Eaton syndrome. Clinical features of myasthenia gravis. Therapy of myasthenia gravis. The Lambert-Eaton myasthenic syndrome. Congenital myasthenic syndromes. Botulism. Neurotoxicology of neuromuscular transmission. Organophosphate and carbamate poisoning. Peripheral nerve hyperexcitability and the neuromuscular junction.