Homo sapiens cornea http://upload.wikimedia.org/wikipedia/commons/1/1e/Schematic_diagram_of_the_human_eye_en.svg CALOHA:TS-0171 BTO:0000286 corneal tunica cornea corneas VHOG:0000164 MESH:D003315 AAO:0010344 XAO:0000180 The transparent anterior portion of the fibrous coat of the eye that serves as the chief refractory structure. UMLS:C0010031 GAID:892 EHDAA:10199 EV:0100341 EFO:0000377 FMA:58238 MA:0000266 UBERON:0000964 EMAPA:17161 Wikipedia:Cornea SCTID:181162001 NCIT:C12342 ZFA:0000640 EHDAA2:0000316 cornea of camera-type eye TAO:0000640 Compared to terrestial animals, the cornea of zebrafish is relatively flat. It consists of nonpigmented, stratified squamous nonkeratinizing epithelial cells, attached to a thick basement membrane that is considered to be analogous to the Bowman's membrane in mammals. In fish, and aquatic vertebrates in general, the cornea plays no role in focusing light, since it has virtually the same refractive index as water multicellular anatomical structure neural crest-derived structure