J Comp Neurol 1968; 133: 383-409

The septum in the human brain.

Andy OJ, Stephan H

"The septum of the human brain was studied in relation to its location, composition and development. It was possible to divide it into two parts: septum pellucidum, composed of fiber tracts and glia, and septum verum (true septum) which in addition to fiber tracts and glia, contain neurons arranged in a nuclear pattern. The septum verum in the human corresponds to the septum as described in lower forms. The human septum has been thought to have regressed and be nearly functionless in contrast to lower forms. However, the nucleus septalis triangularis is the only septal nucleus which regressed in development when compared to that in the brains of insectivores and primates. The rest of the septal nuclei progressively increased in size during primate development. Finally, it should be emphasized that the septum verum of the human has attained its highest degree of development in primate phylogeny" (Andy and Stephan, op. cit., p. 383).