<prompt> Which of the following is not a derivative of neural ectoderm?Sphincter pupillaeRetinaDilator pupillaeCiliary muscles  <response>: Ans. d. Ciliary muscles Ref: Parson 20e p5; Grays Anatomy 40ep702 Ciliary muscles develop from Neural crest, not from neural crestDerivative of neural ectoderm:Ciliary- body epitheliumQIris epitheliumQSmooth muscles of iris constrictorQ and dilator pupillaeQPart of vitreousRetinal pigment epitheliumQRetinaQ its 9 sensory- layersOptic vesicle and cupOptic nerveQ fibersPrimordial Tissues and Ocular DerivativesNeural-EctodermSurface-EctodermMesodermNeural crest Ciliary body epitheliumQ Iris epitheliumQ Smooth muscles of iris constrictorQ and dilator pupil laeQ Part of vitreous Retinal pigment epitheliumQ Retina its 9 sensory layers Optic vesicle and cup Optic nerveQ fibers Conjunctival epithelium Corneal epithelium Lacrimal glands Tarsal glands Lens Extra-ocular musclesQ Vascular endothelium of eye and orbit Corneal stroma Sclera Iris Choroid Part of vitreous Orbital bones Orbital connective tissue Ciliary musclesQ Ciliary ganglionQ Schwann cells of ciliary nerves Meningeal sheath of optic nerve Conjunctival and uveal melanocytes ScleraQ Trabecular meshwork of endothelium Corneal stroma, keratocytes and endotheliumQ Iris stroma Choroidal stroma Part of vitreous 