How to find primary sources of information?

Science
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(Topic from @Ruslan82)

Certain nuclear divisions can be seen on the atlas Аlen of the human brain. For example, BNST is divided like this:

atlas.brain-map.org

Снимок экрана 2020-11-03 в 10.45.47

I would like to understand on what principle such a division comes? Is there any original article, or is this an author’s division?

Of particular interest are the inputs / outputs to these divisions. I hope to find them when will find describing the principles by which such a division was made.

The same applies to two other nuclei: LSN (lateral septal nucleus), and PAG (periaqueductal gray substance).

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Detailed references on the development and annotation of reference atlases (including delineation of anatomical boundaries) can be accessed in the publications, Supplemental Materials and Documentation associated with each atlas.