What type of brain structure is the claustrum classified as?

The claustrum is classified as a white matter structure because it consists primarily of myelinated fibers, which are responsible for transmitting signals between different brain regions. White matter is composed of the myelinated axons that facilitate communication within the brain, linking various areas of the cortex and other regions. The glucocorticoid neurons found in the claustrum play vital roles in higher cognitive functions and the integration of sensory experiences, supporting its classification.

The other options do not accurately represent the primary classification of the claustrum. While it is indeed involved in sensory processing and has connections to areas of the basal ganglia, its defining characteristic is that it is a white matter structure rather than being predominantly categorized under the limbic system or specific sensory processing areas. Understanding the structural composition of the claustrum helps clarify its functional role in the broader context of neuroanatomy.