Breckenridge, CO. Online Offers. Established in 1859, the historic town of Breckenridge is a home rule municipality that is the county seat of Summit County, Colorado, United States. As of the 2010 Census, the town had a population of 4,540. The town also has many part-time residents, as many people have vacation homes in the area. Breckenridge is also a popular ski resort during the winter months, servicing multi-difficulty ski slopes on the Rocky Mountains.
substantia nigra - a layer of deeply pigmented grey matter in the midbrain; associated with the striate body; is involved in metabolic disturbances associated with Parkinson's disease and with Huntington's disease. locus niger, nucleus niger. neural structure - a structure that is part of the nervous system.
Substantia nigra. The substantia nigra is a basal ganglia structure located in the midbrain that plays an important role in reward and movement. Substantia nigra is Latin for black substance, reflecting the fact that parts of the substantia nigra appear darker than neighboring areas due to high levels of neuromelanin in dopaminergic neurons. It was discovered in 1784 by FÃ©lix Vicq-d'Azyr, and Samuel Thomas von SÃ¶mmerring alluded to this structure in 1791. Parkinson's disease is characterized by the death ...