###Rationale: SURFACE ECTODERM - LENS- Epithelium of the all structures except ciliary body & iris- Glands NEURAL ECTODERM - Epithelium of ciliary body & iris- Retinal pigment epithelium- Optic nerve- Sphincter and dilator pupillae muscles - Smooth muscles of iris MESODERM - EXTRAOCULAR MUSCLES- Endothelium of all the orbit & stroma of iris & ciliary body- Sclera (temporal pa) NEURAL CREST - Stroma of cornea & choroid - Corneal endothelium - Sclera (except temporal pa) -Melanocytes -Corneal keratocytes -Ciliary muscles -Ciliary ganglion -Stroma of iris -Choroid Trabecular meshwork

###Answer: OPTION B IS CORRECT.
###Question: Corneal endothelium is derived from:
###Options:
A. Neuroectoderm
B. Neural crest cells
C. Mesoderm
D. Surface ectoderm
