NCIt definition : An ovoid mass composed predominantly of gray substance and associated laminae of white
substance. The thalamus is divided into anterior, medial, and lateral parts. The function
of the thalamus is to relay sensory impulses and cerebellar and basal ganglia projections
to the cerebral cortex. The thalamus is positioned within the posterior part of the
diencephalon forming most of each lateral wall of the third ventricle.;
Alternative definition : CDISC: The portion of the diencephalon forming most of each lateral wall of the third
ventricle.; NCI-GLOSS: An area of the brain that helps process information from the senses and
transmit it to other parts of the brain.;