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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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Smooth muscle of the IRIS is developed from-
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The correct answer is  Ans- D. Neuroectoderm forms iris muscles. Mesoderm gives rise to blood vessels and choroid Sphicter papillae and dilator papillae are smooth muscles of iris which are developed from neuroectoderm. Sphincter papillae - a circular bundle of smooth muscles running around the pupillary margin- causes constriction of the pupil. Dilator papillae- arranged radically near the root of the iris,causes dilation of the pupil.