Which ocular structures are primarily derived from neural crest?

• A. Corneal stroma and endothelium, iris stroma, ciliary body stroma, trabecular meshwork, sclera, and parts of the choroid
• B. Lens and retina
• C. Optic nerve and retina
• D. Photoreceptors and RPE

Answer: (A)

Neural crest cells form the anterior segment mesenchyme that populates the developing eye and gives rise to most of its connective tissues outside the lens and retina. As development proceeds, these neural crest–derived cells migrate into the corneal stroma and endothelium, iris stroma, ciliary body stroma, trabecular meshwork, sclera, and portions of the choroid. This pattern explains why those specific structures are neural crest derivatives.

In contrast, the lens and retina come from neural ectoderm (the lens from surface ectoderm induced to form a lens placode; the retina from the optic cup’s neural tissue). The optic nerve and retinal tissue are likewise neural ectoderm/CNS derivatives rather than neural crest. Photoreceptors and the retinal pigment epithelium (RPE) are also derived from neural ectoderm, not neural crest.