reticular formation

noun

1. a network of neurons in the brainstem involved in consciousness, regulation of breathing, the transmission of sensory stimuli to higher brain centers, and the constantly shifting muscular activity that supports the body against gravity.

n.

1. A massive but vaguely delimited neural apparatus composed of closely intermingled gray and white matter, extending the length of the spinal cord and into the diencephalon, and having a dominant role in the central control of autonomic and endocrine functions, bodily posture, skeletomuscular reflex activity, and general behavioral states.reticular substance

1. A complex network of neurons and axons that is located throughout the brainstem. The reticular formation regulates consciousness, sleep, and wakefulness.