1. These axons also synapse with lower motor neurons in the ventral horns . 2. Originates from ventral horn at lumbosacral spinal levels. 3. Also, Onuf s nucleus is found almost symmetrically on both sides of the ventral horn . 4. In essence the Renshaw cells regulate the firing of the alpha motor neuron leaving the ventral horn . 5. These axons synapse with lower motor neurons in the ventral horns of all levels of the spinal cord. 6. In the spinal cord, ?-MNs are located within the gray matter that forms the ventral horn . 7. Motor pools that control flexor muscles are located dorsally to the ventral horn while those that control extensor muscles are located ventrally. 8. For example, poliomyelitis is caused by a virus that specifically targets and kills motor neurons in the ventral horn of the spinal cord. 9. In the developing spinal cord, Nkx-2.2 regulates IRX3 thereby contributing to the proper differentiation of the ventral horn neurons. 10. These lower motor neurons, unlike those of the DL, are located in the ventral horn all the way throughout the spinal cord.
