<prompt> Lens develops from: September 2012Neural crestMesodermNeuroectodermSurface ectoderm  <response>: Ans. D i.e. Surface ectoderm Embryology of eyeball Structures derived from mesoderm: Corneal stroma endothelium, Only smooth muscles of iris, All muscles EXCEPT iris muscle Structures derived from surface ectoderm: Conjunctival epithelium, Lens Structures derived from neuroectoderm: Epithelium of iris ciliary body, Muscles of iris constrictor dilator pupillae 