marginal nucleus of spinal cord marginal nucleus of spinal cord the marginal nucleus of spinal cord, or posteromarginal nucleus, rexed lamina i, is located at the most dorsal aspect of the dorsal horn of the spinal cord. the neurons located here receive input primarily from lissauer's tract and relay information related to pain and temperature sensation. pain sensation relayed here cannot be modulated, e.g. pain from burning the skin. the axons of neurons contribute to the lateral spinothalamic tract. posteromarginal nucleusmedulla spinalis (rexed lamina i labeled at upper left.)detailsidentifierslatinnucleus marginalis medullae spinalis, lamina spinalis ineuronames2138ta98a14.1.02.117ta26065fma68862anatomical terms of neuroanatomy