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| Locus Coeruleus Locus Caeruleus | Locus Ceruleus | Nucleus Pigmentosus Pontis | Pontis, Nucleus Pigmentosus Bluish region in the superior angle of the fourth ventricle floor, corresponding to melanin-like pigmented nerve cells which lie lateral to the ponto-mesencephalic central gray (griseum centrale). It is also known as nucleus pigmentosus pontis. |