Term: Pedunculopontine nucleus

Definition: Jacobsohn 1909; Olszewski and Baxter 1954; Rye et al. 1987. Rye et al. (1987) regard the subpopulation of cholinergic neurons in this region as the pedunculopontine “nucleus” (see note 61); the region outlined here contains all of the cells identified earlier in the PPN (Jacobsohn 1909; Olszewski and Baxter 1954), although cholinergic neurons provide a very useful guide to its borders and seem to predominate numerically.

Nomenclature: Swanson-2004