AUTHOR=Todd Andrew J. TITLE=An Historical Perspective: The Second Order Neuron in the Pain Pathway JOURNAL=Frontiers in Pain Research VOLUME=3 YEAR=2022 URL=https://www.frontiersin.org/journals/pain-research/articles/10.3389/fpain.2022.845211 DOI=10.3389/fpain.2022.845211 ISSN=2673-561X