Abnormal Proximal Axons of Clarke’s Neurons In Sporadic Motor Neuron Disease

SUMMARY: Filamentous axonalmasses, similar to the abnormal enlargements found in the ventral horns, were found in Clarke’s nucleus in six cases of sporadic A LS. Clarke’s nucleus is generally thought to be normal in sporadic A LS, but the present findings, in conjunction with distal spinocerebellar degeneration which is often described, suggest that this system is also pathologically involved.