The spinal cord Table 2. Important Subdivision of Spinal Cord Gray Matter Region Lamina Nucleus Posterior horn Marginal layer Substantia gelatinosa II IV Nucleus proprius Intermediate zone Nucleus thoracicus(C8-L3 Intermediolateral nucleus(T1-L3) Sacral parasympathetic nucleus(S2-S4) Intermediomedial nucleus Anterior horn I Motor neuronThe spinal cord Region Lamina Nucleus Posterior horn Ⅰ Marginal layer Ⅱ Substantia gelatinosa Ⅲ, Ⅳ Nucleus proprius Intermediate zone Ⅶ Nucleus thoracicus (C8~L3) Intermediolateral nucleus (T1~L3) Sacral parasympathetic nucleus (S2~S4) Intermediomedial nucleus Anterior horn Ⅸ Motor neuron Table 2. Important Subdivision of Spinal Cord Gray Matter