Embryology and genetics

Question 1

Ocular structures derived from the surface ectoderm

Answer 1

External to internal:

• Eyelids
• Cojuctival and corneal epithelium
• Nasolacrimal duct, lacrimal glands
• Lens

Question 2

Ocular structures derived from the neuroectoderm

Answer 2

Pigment epithelium of retina, iris and ciliary body

Neurosensory retina

Optic nerve

Pupillary sphincter and dilator muscles

Question 3

Ocular structures derived from the neural crest

Answer 3

Corneal endothelium

Stroma of cornea, iris and ciliary body

Traebecular meshwork

Ciliary muscles

Choroid

Sclera

Orbital cartilage and bone

Question 4

Ocular structures derived from the mesoderm

Answer 4

Extraocular muscles

Blood vessels

Schlemm’s canal endothelium

Temporal sclera