Abstract
A new subdivision, the “marginal division” (MrD), was discovered at the caudal border of the striatum and surrounds the rostral edge of the globus pallidus in the rat brain in our previous studies. The neuronal somata of the MrD are mostly fusiform in shape with their long axes lining dorsoventrally. The MrD is more densely filled with substance P (SP)-, Leucine-enkephalin (L-Enk)-, dynorphin B-, neurotensin-, somatostatin- and cholecystokinin (CCK)-immunoreactive fibers and terminal-like structures than the rest of the striatum. The MrD was confirmed in the cat neostriatum as well. The present study intended to explore whether the MrD exists in the monkey neostriatum (putamen) with Nissl, histochemical and immunohistochemical methods. A band of fusiform neurons were obviously identified at the caudomedial edge of the putamen. These neurons lie outside the lateral medullary lamina and indirectly surround the rostrolateral border of the globus pallidus. The abundance of SP-, L-Enk-, neuropeptide Y-, CCK-, dopamine- and serotonin-positive fibers and terminal-like structures with a few positive fusiform neurons accumulating at the caudomedial border of the putamen obviously distinguishes this zone from the rest of neostriatum and globus pallidus. The acetylcholinesterase (AChE) positive and nicotinamide adenine dinucleotide phosphate diaphorase (NADPH-d) containing fusiform neurons are distinctly visualized in the same zone. The morphological figure and the location of these neurons, and the histochemical and immunohistochemical characteristics of this area coincide well with those of the MrD in the rat and cat striatum. This study thus convincingly identifies the existence of the MrD in the monkey neostriatum. It is fairly asserted that the MrD is a universal structure in the mammalian brain.
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Shu, S.Y., Bao, X.M., Zhang, C. et al. A New Subdivision, Marginal Division, in the Neostriatum of the Monkey Brain. Neurochem Res 25, 231–237 (2000). https://doi.org/10.1023/A:1007523520251
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DOI: https://doi.org/10.1023/A:1007523520251