Schematic drawings of 20 μm rostrocaudal coronal sections illustrating the distribution and relative density of hcrt fibers in the pons after immunohistochemistry for hcrt using antibody #2050. 2,3, Cerebellar lobules;4V, 4th ventricle; 6, abducens nucleus;7n, facial nerve or its root; 8vn, vestibular root, vestibulocochlear nerve; Acs6/7, accessory abducens and facial nuclei; CnF, cuneiform nucleus; g7, genu of the facial nerve;IC, inferior colliculus; KF, Kölliker–Fuse nucleus; LC, locus coeruleus;LDTg, laterodorsal tegmental nucleus;LPB, lateral parabrachial nucleus; LSO, lateral superior olive;mcp, middle cerebellar peduncle; Me5, mesencephalic trigeminal nucleus; mlf, medial longitudinal fasciculus; MSO, medial superior olive;PCRtA, parvocellular reticular nucleus, α part;PDTg, posterodorsal tegmental nucleus;PnC, pontine reticular nucleus, caudal part;PnO, pontine reticular nucleus, oral part;Pr5, principal sensory trigeminal nucleus;py, pyramidal tract; RMg, raphe magnus nucleus; RPa, raphe pallidus nucleus;RPn, raphe pontis nucleus; rs, rubrospinal tract; RtTg, reticulotegmental nucleus of the pons; scp, superior cerebellar peduncle;sp5, spinal trigeminal tract; Sp5O, spinal trigeminal nucleus, oral part; SubCA, subcoeruleus nucleus, α part; SubCV, subcoeruleus nucleus, ventral part; SuVe, superior vestibular nucleus; Tz, nucleus of the trapezoid body.