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Distribution and morphology of callosal commissural neurons within the motor cortex of normal and reeler mice

Retrograde transport of horseradish peroxidase was used to examine the cells of origin, of the callosal commissural fibers (CC neurons) in the primary motor cortex of normal and reeler mice. Quantitative analysis of the intracortical, laminar distribution, and dendritic orientation of CC neurons was performed in conjunction with qualitative observation of their morphology. For comparison, similar quantitative data were obtained for the cells of origin of the corticospinal tract (CST) of normal and reeler mice from materials described previously by Terashima et al. ('83).