Elimination of egg pigment from developing ocular tissues in the frog Rana pipiens☆
[摘要] Themethodbywhicheggpigmentiseliminatedfromthedevelopingretina,cornealepitheliumandlensinRanapipienswasstudiedwithlightandelectronmicroscopy.Theretinaexpellseggpigmentintothespacebetweentheretinaandpigmentepithelium.Thispigmentisthenengulfedbythepigmentepithelialcells.Thecornealepitheliumeliminateseggpigmentdirectlytotheoutsideviathefreesurfaceoftheepithelialcells.Eggpigmentaccumulatesinafewcellsinthelens.Thesecellsprobablydegenerateandareextruded.Theseectodermalderivativesintheeyearefreeofeggpigmentlongbeforeectodermalderivativesinotherpartsoftheembryolosetheirpigment.Theearlyeliminationofeggpigmentfromoculartissuesmayrelatedtothefactthatthesetissuesmustbetransparentinorderthatlightmaypassfreelytothephotoreceptors.
[发布日期] [发布机构]
[效力级别] [学科分类] 生物科学(综合)
[关键词] [时效性]