Nucleus niger is a Latin term that refers to the substantia nigra of the brain, a darkly pigmented area located in the midbrain. This region is involved in numerous vital functions such as motor control, reward, learning, and addiction. There are various synonyms for the nucleus niger, including the dark nucleus, black substance, and substantia nigra. These terms are used interchangeably to represent this vital center of the brain that regulates movement and reward mechanisms. Aside from this, the nucleus niger is also closely related to several neurological conditions and disorders, including Parkinson's disease, neurodegenerative diseases, and mood disorders. Overall, understanding the synonyms of nucleus niger is essential for better comprehension of the complex machinery of the human brain.