The Radiatio thalami or thalamus radiation is the totality of the projections from the thalamus to the cerebral cortex on the same side . These are both nerve fibers that run from the thalamus to the cerebral cortex (thalamocortical) and receding (corticothalamic) connections. The nerve fibers narrow through the internal capsule and then expand again like rays. The thalamic radiation is divided into anterior, upper, lower and posterior thalamic stalk. Since almost all nerve impulses with the exception of the olfactory tract run to the cerebral cortex via the thalamic radiation, this plays a central role in consciousness.