Morphology of the human septal area: a topographic atlas.

The cell-groups of the human septum pellucidum are demonstrated in a series of 27 frontal sections. The basal part of the septum which contains mainly nerve cells extends 14-16 mm in the oro-caudal direction. Within this region two medial nuclei with 6 subdivisions and two lateral nuclei with 3 subdivisions were distinguished. The definition of oro-caudal coordinates and the topographical description of nuclei may be of help in localizing with sufficient accuracy clinico-pathological alterations of the septum.