part of part of has part has part has quality has quality bounding layer of bounding layer of develops from develops from sulfated glycosaminoglycan collagen type IV trimer transparent acellular anatomical structure lens of camera-type eye capsule of lens http://upload.wikimedia.org/wikipedia/commons/5/55/Gray883.png Wikipedia:Lens_(anatomy)#Lens_capsule EHDAA2:0000977 UMLS:C0229232 UBERON:0001804 ZFA:0005574 MA:0001300 SCTID:244500004 NCIT:C32975 FMA classifies this is a capsule and hence an organ part. In contrast we classify this as acellular capsula lentis lens capsule (...) 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 (reference 1); Although the eye varies greatly in adaptative details among vertebrates, its basic structure is the same in all. The human eye is representative of the design typical for a tetrapod. (...) A watery aqueous humor fills the spaces in the eye in front of the lens (...) (reference 2).[well established][VHOG] The transparent membrane which surrounds the lens of the eye. [Dorian_AF, Elsevier's_encyclopaedic_dictionary_of_medicine, Part_B:_Anatomy_(1988)_Amsterdam_etc.:_Elsevier][VHOG] FMA:58881 The elastic, clear, membrane-like structure, that is outer most layer of the lens. synthesized by the lens epithelium and its main components are Type IV collagen and sulfated glycosaminoglycans (GAGs). [Wikipedia:Capsule_of_lens VHOG:0000550 EMAPA:18237 ectoderm-derived structure lens anterior epithelium acellular membrane