reticular formation

noun

: a mass of nerve cells and fibers situated primarily in the brain stem that plays an important role in controlling autonomic functions (such as respiration), reflexive movement, posture and balance, and consciousness and the sleep-wake cycle

Word History

First Known Use

1887, in the meaning defined above

Medical Definition

reticular formation

noun

: a mass of nerve cells and fibers situated primarily in the brain stem and functioning upon stimulation especially in arousal of the organism

called also reticular substance