You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Smooth muscle of the IRIS is developed from- and explain in detail?
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.