part of develops from start stage end stage telencephalon TAO:0000079 zebrafish_anatomy ZFA:0000079 The anterior and dorsal forebrain neuromere. In ray-finned fishes and most pronounced in teleosts the roof plate of the embryonic telencephalon extends laterally with the effect that the paired alar plates forming the hemispheric walls roll out lateroventrally in a process called eversion. This is unlike the development in other vertebrate groups. From Neuroanatomy of the Zebrafish Brain. forebrain presumptive telencephalon multi-tissue structure segmentation:10-13 somites adult