Sphincter and dilator pupillae develop from: (A) Mesoderm, (B) Surface ectoderm, (C) Neuroectoderm, (D) Endoderm
Answer is C. Muscles of the iris (sphincter and dilator papillae) and myoepithelial cells of the sweat glands are derived from ectoderm.Ref: Human Embryology; Inderbir Singh; Tenth edition; Page no:113