specific relay nuclei receive less than 10 % of their brainstem afferents from non-cholinergic neurons located at rostral midbrain levels and receive 85-96 % of their brainstem innervation from a region at midbrain-pontine junction where the cholinergic peribrachial area and laterodorsal tegmental nucleus are maximally developed .
C0006121
brainstem
C0025462
midbrain