The term subcortical sensory systems refers to one of three basic components of the cerebrospinal trunk of the central nervous system segmented on the basis of embryogenesis, connectivity and function ( Swanson-2004 ).The other components are the behavioral state system and the subcortical motor system. The subcortical sensory systems include the set of structures of the cerebrospinal trunk that are primarily involved in processing inputs from the external environment and from internal organs ( Swanson-2003 ). Specifically they include structures of the subcortical visual system, the somatosensory system, the subcortical auditory system, the gustatory system, the viscerosensory system, the humerosensory system and related nuclei of the thalamus.