Definition: the apical part of the posterior horn (dorsal horn; posterior gray column) of the spinal cord's gray matter, composed largely of very small nerve cells; its gelatinous appearance is due to its very low content of myelinated nerve fibers; spinal lamina II (of Rexed).
Synonym(s): substantia gelatinosaTA, lamina spinalis II, spinal lamina II, Rolando gelatinous substance, Rolando substance
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