Fig. 10. Schematic drawings of 20 μm rostrocaudal coronal sections illustrating the distribution and relative density of hcrt fibers in the midbrain after immunohistochemistry for hcrt using antibody #2050. APir, Amygdalopiriform transition area;APT, anterior pretectal nucleus; Aq, aqueduct; ATg, anterior tegmental nucleus;CA1–CA3, fields CA1–CA3 of Ammon’s horn;CG, central gray; cp, cerebral peduncle;ctg, central tegmental tract; Dk, nucleus Darkschewitsch; DpMe, deep mesencephalic nucleus; DR, dorsal raphe nucleus; Ent, entorhinal cortex; fr, fasciculus retroflexus;HiF, hippocampal fissure; IC, inferior colliculus; InCo, intercollicular nucleus;InG, intermediate gray layer of the superior colliculus;lfp, longitudinal fasciculus of the pons;LL, lateral lemniscus; LPMC, lateral posterior thalamic nucleus, mediocaudal part; Me5, mesencephalic trigeminal nucleus; MGV, medial geniculate nucleus, ventral part; MiTg, microcellular tegmental nucleus; ml, medial lemniscus; mlf, medial longitudinal fasciculus; MnR, median raphe nucleus; OT, nucleus of the optic tract;PBG, parabigeminal nucleus; pc, posterior commissure; PMCo, posteromedial cortical amygdaloid nucleus; Pn, pontine nuclei; PoDG, polymorph layer of the dentate gyrus; PPT, posterior pretectal nucleus; PPTg, pedunculopontine tegmental nucleus; PRh, perirhinal cortex; R, red nucleus; SC, superior colliculus; SNC, substantia nigra, compact part; SNL, substantia nigra, lateral part; SNR, substantia nigra, reticular part;SuG, superficial gray layer of the superior colliculus;Te, temporal cortex; VTA, ventral tegmental area; xscp, decussation of the superior cerebellar peduncle.