part of part_of develops from anatomical structure 解剖结构 lens of camera-type eye 照相机式眼部晶状体 AAO:0010348 BTO:0000723 CALOHA:TS-0545 EHDAA:9057 EMAPA:17838 EV:0100343 FMA:58241 MA:0000275 MAT:0000141 MESH:A09.371.509 MIAA:0000141 OpenCyc:Mx4rvVj0fZwpEbGdrcN5Y29ycA RETIRED_EHDAA2:0000975 TAO:0000035 The eye of the adult lamprey is remarkably similar to our own, and it possesses numerous features (including the expression of opsin genes) that are very similar to those of the eyes of jawed vertebrates. The lamprey's camera-like eye has a lens, an iris and extra-ocular muscles (five of them, unlike the eyes of jawed vertebrates, which have six), although it lacks intra-ocular muscles. Its retina also has a structure very similar to that of the retinas of other vertebrates, with three nuclear layers comprised of the cell bodies of photoreceptors and bipolar, horizontal, amacrine and ganglion cells. The southern hemisphere lamprey, Geotria australis, possesses five morphological classes of retinal photoreceptor and five classes of opsin, each of which is closely related to the opsins of jawed vertebrates. Given these similarities, we reach the inescapable conclusion that the last common ancestor of jawless and jawed vertebrates already possessed an eye that was comparable to that of extant lampreys and gnathostomes. Accordingly, a vertebrate camera-like eye must have been present by the time that lampreys and gnathostomes diverged, around 500 Mya.[well established][VHOG] The lens is avascular and nourished by diffusion from the aqueous and vitreous This class excludes compound eye corneal lenses. Transparent part of camera-type eye that helps to refract light to be focused on the retina. UBERON:0000965 UMLS:C0023317 VHOG:0000169 XAO:0000008 ZFA:0000035 camera-type eye lens camera-type eye lens crystalline lens crystalline lens eye lens eye lens lens lens lens crystallina lens crystallina lenses lenses ocular lens ocular lens uberon 成年七鳃鳗的眼睛与我们自己的眼睛非常相似，并且它具有许多特征（包括视蛋白基因的表达），这些特征与有颚脊椎动物的眼睛非常相似。猛禽的照相机式眼睛有晶状体、虹膜和眼外肌(其中5个,不像有六个的颚脊椎动物的眼睛),尽管它没有眼内肌。视网膜的结构也与其他脊椎动物的视网膜非常相似，有三个核层，由感光细胞和双极、水平、无长突和神经节细胞体组成。南半球七鳃鳗(Geotria australis)具有五种形态类型的视网膜感光细胞和五种视蛋白类型，每种类型的视蛋白都与有颚脊椎动物的视蛋白密切相关。鉴于这些相似性，我们得出了无可避免的结论，即无颌和有颌脊椎动物的最后一个共同祖先已经拥有了与现存的七鳃鳗和颌口类相当的眼睛。 晶状体(crystalline lens) 晶状体(crystalline lens) 晶状体(lens crystallina) 晶状体(lens crystallina) 晶状体(lens) 晶状体(lens) 晶状体(lenses) 晶状体(lenses) 晶状体是血管性的，通过水和玻璃的扩散而得到营养。 目镜(eye lens) 目镜(eye lens) 目镜(ocular lens) 目镜(ocular lens) 相机型眼的透明部分，有助于折射光线以聚焦在视网膜上。 相机式眼晶状体 相机式眼晶状体 该类不包括复眼角膜晶状体。 anterior segment of eyeball 眼球前段 lens placode 晶状体基板 ectoderm-derived structure 外胚层衍生结构 transparent eye structure 透明的眼睛结构 lens vesicle 晶状体泡