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refers to six groups of large neurons that occupy a large portion of the midbrain of the rat. The largest and most centrally located on each side of the midbrain is the magnocellular part of the midbrain reticular nucleus. Considerably smaller is the more caudally located ventral tegmental nucleus. Much smaller are the anterior tegmental nucleus and three terminal nuclei of the accessory optic tract: the dorsal nucleus of the accessory optic tract, the medial nucleus of the accessory optic tract, and the lateral nucleus of the accessory optic tract. Functionally the magnocellular nuclei belong to the reticular formation (functional) of the subcortical motor system ( Swanson-2004 ).
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