Spatial characterization of the motor neuron columns supplying the rat forelimb

▶In this study we provided a map of the motor end plates for 11 rat forelimb muscles. ▶We characterized the spatial distribution of the motor columns supplying these muscles. ▶The length and the overlap between some motor neuron columns is greater than previously described. ▶The upper cervical enlargement contains more motor neuron columns than previously reported. ▶This provides a greater understanding of the organization of the motor columns for the rat forelimb.