Definition of "midbrain" [mid•brain]

• The portion of the vertebrate brain that develops from the middle section of the embryonic brain. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Strong responses to near-wins were detected in the midbrain, which is packed with dopamine-releasing brain cells and is an area associated with addiction."
• "We are creating the world's most trusted encyclopedia and knowledge base. log in, you'll be able to edit this page instantly! mesencephalon (also called midbrain) tectum mesencephali (dorsal)"
• "Insets show the rescue of brain parts such as midbrain-hindbrain boundary (arrow) in the embryos coinjected with rp l11mRNA, but not in GFP mRNA-coinjected embryos."