Term: Medial septal complex

Definition: Swanson and Cowan 1979. There is no morphologically distinct border between the medial septal nucleus and nucleus of the diagonal band, although an arbitrary border is often drawn at the widest point in this complex (see Atlas Level 16). This level also shows that it is often convenient to describe horizontal and vertical limbs of the nucleus of the diagonal band (Raisman 1966). Unfortunately, Price and Powell (1970) applied the term “nucleus of the horizontal limb of the diagonal band” to a laterally adjacent cell group that had been widely referred to as the magnocellular preoptic nucleus since the time of Loo (1931), and that projects to the olfactory bulb rather than the hippocampal formation (see notes 61 and 62).

Nomenclature: Swanson-2004