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What is Sphincter and dilator pupillae develop from ? and explain in detail?
Ans. is 'c' i.e., Neuroectoderm Iris muscles (sphincter and dilator pupillae) develop from ectoderm (neuroectoderm).PrecursorDerivativesNeural ectodermSmooth muscle of the iris, opticle vesicle and cup, iris epithelium, ciliary epithelium, Pa of the vitreous, Retina, Retinal pigment epithelium, fibres of the optic nerve.Surface ectodermConjunctival epithelium, Corneal epithelium, Lacrimal glands, Tarsal glands, LensMesodermExtraocular muscles, corneal stroma, sclera, iris, Vascular endothelium, Choroid, Pa of the vitreous.Neural crestCorneal stroma, keratocytes and endothelium, Sclera, Trabecular meshwork endothelium, Iris stroma, Ciliary muscles, Choroidal stroma, Pa of the vitreous, Uveal and conjunctival melanocytes, Meningeal sheaths of the optic nerve, Ciliary ganglion, Schwann cells, orbital bones, Orbital connective tissue, Connective tissue sheath and muscular layer of the ocular and orbital blood vessels.