part of part of substantia nigra pars compacta pedunculopontine tegmental nucleus neuronames:504 UMLS:C0262306 MBA:1052 Wikipedia:Pedunculopontine_tegmental_nucleus peduncular pontine nucleus pedunculopontine nucleus MA:0001020 BIRNLEX:1437 DMBA:16965 MESH:D045042 nucleus tegmenti pedunculopontinus EMAPA:35672 The pedunculopontine nucleus (PPN) (or pedunculopontine tegmental nucleus, PPTN) is located in the brainstem, caudal to the substantia nigra and adjacent to the superior cerebellar peduncle. It is composed by a wide variety of neurochemical cell types, including cholinergic, glutamatergic and GABAergic cells. In the classical sense, the PPN is considered to be one of the main components of the reticular activating system. [WP,unvetted]. HBA:9021 BAMS:PPN FMA:72429 BM:Pons-PPT UBERON:0002142 nucleus pedunculopontinus BAMS:PPTg DHBA:12413 PPTg midbrain reticular formation midbrain raphe nuclei nucleus of midbrain reticular formation