Anatomy
A part of the dorsal striatum is imbedded in the white substance of the hemisphere, and is therefore external to the ventricle; it is termed the extraventricular portion, or the lentiform nucleus.
The remainder, however, projects into the ventricle, and is named the intraventricular portion, or the caudate nucleus.
The dorsal striatum has received its name from the striped appearance presented by a section of its anterior part, in consequence of diverging white fibers mixed with the gray substance that forms its chief mass. From lateral to medial, there lies the external capsule (white matter), the lentiform nucleus (gray matter), the internal capsule (white matter), and the caudate nucleus (gray matter).
Read more about this topic: Dorsal Striatum
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—Ralph Waldo Emerson (1803–1882)