[TA] the intermediate region of the spinal cord gray matter located between the posterior and anterior horns. This area contains a number of nuclei that collectively comprise the Rexed spinal lamina VIII [TA]. The nuclei of the intermediate c., or intermediate zone, are the intermediolateral nucleus in the lateral horn, central intermediate substance, posterior or dorsal thoracic nucleus (nucleus of Clarke), lateral intermediate substance, intermediomedial nucleus, sacral parasympathetic nuclei [TA] (nuclei parasympathici sacrales [TA]), nucleus of pudendal nerve [TA] (nucleus nervi pudendi), portions of the spinal reticular formation [TA] (formatio reticularis spinalis [TA]), and the anterior medial nucleus [TA] (nucleus medialis anterior [TA]). SYN: columna intermedia [TA], intermediate region [TA], intermediate zone [TA].