part of part_of develops from multi-tissue structure 多组织结构 iris 虹膜 anterior uvea irides irises the adjustable membrane, composed of the stroma and pigmented epithelium, located just in front of the crystalline lens within the eye 前葡萄膜 可调节膜由基质和色素上皮组成，位于眼睛内晶状体的正前方 虹膜(irides) 虹膜(irises) ectoderm-derived structure 外胚层衍生结构 optic vesicle 视泡 anterior uvea 前葡萄膜