Sphincter and dilator pupillae develops from: (A) Neuroectoderm, (B) Surface ectoderm, (C) Mesoderm, (D) Endoderm
Answer is A. HUMAN EMBRYOLOGY-INDERBIR SINGH tenth edition Derivatives of neuroectoderm: R-Retina O-Optic stalk/optic nerve M-Muscles of iris(sphicter and dilator pupillae) E-Epithelium of iris/ciliary body