A. Representative Lucifer Yellow (green) filled corticospinal neuron projecting to lower cervical spinal cord shown by retrogradely transported Red Latex Microspheres in the cell body, note several single labeled neurons (red) around the filled neuron. Scale bar =20 μm. B. Representative Lucifer Yellow filled dendrite segment with spines. Scale bar = 10 μm. C. Representative Lucifer Yellow filled corticospinal neuron in layer V of motor cortex. Scale bar = 100 μm.