The anterior of the three primitive cerebral vesicles of the embryonic brain arising from the NEURAL TUBE. It subdivides to form DIENCEPHALON and TELENCEPHALON. (Stedmans Medical Dictionary, 27th ed)
    

concept

Dorsal view of the forebrain of a wild-type zebrafish embryo

Zebrafish eye development

Glutamatergic neurons in the zebrafish forebrain

GABAergic neurons in the Zebrafish

Dopaminergic neurons in the zebrafish forebrain. Confocal micrograph of a 4 day old transgenic zebrafish embryo viewed from a lateral aspect. Neurons in the olfactory bulb, telencepahlon, ventral diencephalon, pretectum and hypothalamus are labelled in green. Axonal tracts are shown in cyan and neuropil in magenta. In order to show the anatomy of the brain better the skin and eyes of the embryo have been removed post-fixation. 

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Zebrafish eye development

Zebrafish eye development

Dorsal view of the forebrain of a wild-type zebrafish embryo

Zebrafish eye development