reticular nucleus

The reticular nucleus is a distinct part of the thalamus, the brain's central relay for sensory information to the cerebral cortex. Unlike other thalamic nuclei, the reticular nucleus forms a shell around the lateral aspect of the thalamus. It is composed of inhibitory neurons that use GABA as a neurotransmitter.1

This nucleus receives input from various cortical areas and the basal ganglia, as well as from thalamic neurons on their way to the cortex. Its primary function is to modulate the flow of signals from other thalamic nuclei and to control rhythmic activity between the thalamus and the cortex. This role is crucial for regulating arousal, attention, and sleep-wake cycles.12