<prompt> Crystalline Lens is derived from JIPMER May 2019Surface ectodermNeuroectodermMesodermEndoderm  <response>: - Eye ball have contribution from several structures - Neural plate ectoderm forms Neural tube form - CNS which have diencephalon pa of brain aExtension of diencephalon optic sulcus into eyeball form retina optic cup optic nerve optic stalk - Neural plate ectoderm also forms - epithelium of ciliary body iris muscle - Muscles of Iris - Sphincter pupillae, dilator pupillae - Eye ball have some contribution from surface ectoderm as well which gives Surface epithelium of cornea 1st layer Eye lens - Most of derivatives in eyeball come from neural crest cells which gives Secondary mesoderm of eyeball - Forms sclera, choroid, ciliary body Iris not epithelium - All other layers of cornea except 1st layer develops from N.C.C 