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(FRAME-INFO (STRING "Nuclei and Laminae. The Rexed laminae are shown here in a section of cat spinal cord. Note in particular the anterior horn  motor neuron groups, most easily divided into a medial group innervating the axial \(trunk\) musculature, and a lateral group \(present only at the enlargements\) innervating the upper and lower extremity musculature. Lamina IX contains the groups of motor neuron nuclei. They are circled in color: lateral groups yellow, and medial groups green."))