Which of the following forms a functional part of the reticular activating system that is responsible for consciousness, sleep and wakefulness?

It is involved in sensory perception and regulation of motor functions. The thalamus also plays an important role in regulating states of sleep and wakefulness. Thalamic nuclei have strong reciprocal connections with the cerebral cortex and forming thalamo cortico thalamic circuits that are believed to be involved with consciousness. The thalamus plays a major role in regulating arousal, the level of awareness, and activity. Damage to the thalamus can lead to permanent coma.