Abstract
Motor neuroblasts comprising the brachial segments of the lateral motor column in the dystrophic chicken were counted at 6, 7, 9, 12, and 18 days of incubation and at 5 days' post-hatching. Comparisons with similar counts from normal chick embryos disclosed that there was a significantly greater depletion of motor neurons in normal embryos between days 9 and 12. These findings suggest that nerve-muscle interaction may be altered early in the development of the motor unit in the dystrophic chick embryo.
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