Surface ectoderm Neural ectoderm
Epithelium of the cornea, conjunctiva, and lacrimal gland and its drainage system
Vitreous body (derived partly from neural ectoderm of the optic cup and partly from mesenchyme)
Epithelium of the retina, iris, and ciliary body
Sphincter pupillae and dilator pupillae muscles
Stroma of the cornea, ciliary body, iris, and choroid Extraocular muscles
Eyelids (except epithelium and conjunctiva)
Hyaloid system (most of which degenerates before birth)
Connective tissue and blood vessels of the eye, bony orbit, and vitreous body the sixth month as derivatives of the neuroectoderm of the outer layer of the optic cup.
The embryonic origins of the individual eye structures are summarized in Table 23.1.
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