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Fig. 2 Zebrafish adult forebrain neuroanatomy shown in transverse Bodian silver/cresyl stained sections [panels modified from Wullimann et al., 1996, see there for full account]. a Precommissural telencephalon. b Commissural telencephalon level. d Rostral diencephalon. e Caudal diencephalon. These four levels show peripherally migrated forebrain cell areas (highlighted with red letters), such as subpallial (Vc, Vl), entopeduncular (ENd, ENv), pretectal (CPN, PSp, PSm, DAO) and preglomerular nuclei (PGl, PGm) (see text). c Shows preoptic region in between (b, d). f Slightly more caudal level than (e) with intermediate nucleus of Hd (see text). g Most caudal diencephalic section with posterior and lateral recess at the same transverse level of caudal hypothalamus (Hc; see text). h Lateral view of adult zebrafish brain with transverse section levels indicated. i Shows drawing of parasagittal section through zebrafish preoptic region (black) [modified from Herget et al., 2014]. Note that the suprachiasmatic nucleus (shown in c) is lateral to the section level. Red line is alar-basal plate boundary. Scale bars, 200 µm. A, anterior thalamic nucleus; ac, anterior commissure; acd, acv, dorsal, ventral anterior commissure; APN, accessory pretectal nucleus [of Wullimann and Meyer [1990]; ATN, anterior tuberal nucleus; CC, cerebellar crest; CCe, corpus cerebelli; CM, corpus mamillare; CP, central posterior thalamic nucleus; CPN, central pretectal nucleus; DAO, dorsal accessory optic nucleus; Dc Dd, Dl, Dm, Dp, central, dorsal, lateral, medial, posterior zone of dorsal telencephalic area; DiL, diffuse nucleus of the inferior lobe; DiV, diencephalic ventricle; dot, dorsomedial optic tract; DP, dorsal posterior thalamic nucleus; DT, dorsal thalamus; EG, eminentia granularis; ENd, ENv, dorsal, ventral entopeduncular nucleus; fr, fasciculus retroflexus; H, (basal) hypothalamus; Ha, habenula; Had, dorsal habenular nucleus; Hav, ventral habenular nucleus; hc, horizontal commissure; Hc, Hd, Hv, caudal, dorsal, ventral zone of periventricular hypothalamus; IN, intermediate nucleus of Hd; lfb, lateral forebrain bundle; LH, lateral hypothalamic nucleus; LI, lobus inferior; LL, lateral line nerves; lot, lateral olfactory tract; LR, lateral recess of diencephalic ventricle; mfb, medial forebrain bundle; MO, medulla oblongata; mot, medial olfactory tract; OB, olfactory bulb; oc, optic chiasma; ot, optic tract; pc, posterior commissure; PG, preglomerular complex; PGI, lateral preglomerular nucleus; PGm, medial preglomerular nucleus; Pit, pituitary; PM, magnocellular preoptic nucleus; PMg, gigantocellular part of PM; poc, postoptic commissure; PPa, anterior parvocellular preoptic nucleus; PPd, dorsal periventricular pretectal nucleus; PPp, posterior parvocellular preoptic nucleus; PPv, ventral periventricular pretectal nucleus; PSm, magnocellular superficial pretectal nucleus; PSp, parvocellular superficial pretectal nucleus; PTN, posterior tuberal nucleus; PVO, paraventricular organ; SC, suprachiasmatic nucleus (spinal cord in H); SD, saccus dorsalis; SY, sulcus ypsiloniformis; tc, tectal commissure; Tel, telencephalon; TeO, tectum opticum; TeV, tectal ventricle; TH, tuberal hypothalamus; TL, torus longitudinalis; TLa, torus lateralis; TP, posterior tuberculum; TPp, periventricular nucleus of TP; tpm, tractus pretectomamillaris; Vc, Vd, Vl, Vs, Vv, central, dorsal, lateral, supracommissural, ventral nucleus of ventral telencephalic area; VL, ventrolateral thalamic nucleus; VLo, vagal lobe; VM, ventromedial thalamic nucleus; vot, ventrolateral optic tract; VT, ventral thalamus (prethalamus); I, olfactory nerve; II, optic nerve; IV, trochlear nerve; V, trigeminal nerve; VII, facial nerve; X, vagal nerve.