Which of the following is not a neural crest derivative?: (A) Ciliary muscle, (B) Melanocytes, (C) Ciliary ganglion, (D) Sphincter pupillae
Answer is D. Sphincter pupillae is derived from neurectoderm not mesenchyme or neural crest cell Neural Crest Derivatives: *Corneal Keratocytes *Ciliary muscles *Corneal stroma and endothelium (endothelial cells and keratocytes) *Pericytes of choroidal membranes *Melanocytes *Ciliary ganglion *Stroma of Iris and choroid Trabecular meshwork extraocular muscles are mesodermal in origin