part of part_of develops from tissue 组织 neurectoderm 神经外胚层 eye primordium 眼原基 ectoderm-derived structure 外胚层衍生结构 optic vesicle 视泡 The optic vesicle is the evagination of neurectoderm that precedes formation of the optic cup[GO]. Portion of tissue that is comprised of neuroepitheium which has pinched off from the anterior neural keel and will form the optic cup[ZFA]. evagination eye vesicle ocular vesicle optic vesicles 外翻 眼囊 眼囊泡 视神经囊泡 视神经泡是在视神经杯形成之前的神经外胚层的转角[GO]。组织的一部分，由前神经龙骨夹断并形成视杯的神经鞘瘤组成[ZFA]。 immature eye 未成熟眼部