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. Author manuscript; available in PMC: 2017 Feb 8.
Published in final edited form as: Stereotact Funct Neurosurg. 2016 Oct 11;94(5):298–306. doi: 10.1159/000449010

Fig. 1.

Fig. 1

The PPN region at the level of the decussation of the superior cerebellar peduncles and the inferior colliculus (a) and at the level of the trochlear nucleus and the intercollicular area (b). The main nuclei are labeled on the left and the long fiber tracts on the right side. STT = Spinothalamic tract; CA = cerebral aqueduct; CN = cuneiform nucleus; CTT = central tegmental tract; Dec SCP = decussation of the superior cerebellar peduncles; LC = locus coeruleus; LL = lateral lemniscus; ML = medial lemniscus; MLF = medial longitudinal fasciculus; NRD = nucleus raphe dorsalis; PAG = periaqueductal gray; PN = pontine nuclei; PPNc = pedunculopontine nucleus pars compacta; PPNd = pedunculopontine nucleus pars dissipata; SNc = substantia nigra pars compacta; RST = rubrospinal tract; IV = trochlear nucleus; V = mesencephalic nucleus of the trigeminal nerve. Adapted from Fournier-Gosselin et al. [35], with permission.